refactor: restructure nip64Chess to match nip88Polls pattern

Reorganize nip64Chess event classes into individual packages with
dedicated tag classes, TagArrayBuilderExt, and TagArrayExt files,
following the same structure used by nip88Polls.

New package structure:
- challenge/ - LiveChessGameChallengeEvent with PlayerColorTag, TimeControlTag
- accept/ - LiveChessGameAcceptEvent with ChallengeEventTag
- move/ - LiveChessMoveEvent with GameIdTag, MoveNumberTag, SanTag, FenTag
- end/ - LiveChessGameEndEvent with ResultTag, TerminationTag, WinnerTag
- draw/ - LiveChessDrawOfferEvent
- game/ - ChessGameEvent (Kind 64)
- jester/ - JesterEvent, JesterProtocol, JesterContent, JesterGameEvents

Each tag class follows the companion object pattern with isTag(),
parse(), and assemble() methods. Each event package includes
TagArrayBuilderExt for building and TagArrayExt for parsing.

https://claude.ai/code/session_01Qtzhka3p5N3Hbns4xrRbsv

amethyst/src/main/java/com/vitorpamplona/amethyst/model/LocalCache.kt

@@ -169,13 +169,13 @@ import com.vitorpamplona.quartz.nip58Badges.BadgeProfilesEvent
 import com.vitorpamplona.quartz.nip59Giftwrap.WrappedEvent
 import com.vitorpamplona.quartz.nip59Giftwrap.seals.SealedRumorEvent
 import com.vitorpamplona.quartz.nip59Giftwrap.wraps.GiftWrapEvent
-import com.vitorpamplona.quartz.nip64Chess.ChessGameEvent
-import com.vitorpamplona.quartz.nip64Chess.JesterEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessDrawOfferEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessGameAcceptEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessGameChallengeEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessGameEndEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessMoveEvent
+import com.vitorpamplona.quartz.nip64Chess.game.ChessGameEvent
+import com.vitorpamplona.quartz.nip64Chess.jester.JesterEvent
+import com.vitorpamplona.quartz.nip64Chess.draw.LiveChessDrawOfferEvent
+import com.vitorpamplona.quartz.nip64Chess.accept.LiveChessGameAcceptEvent
+import com.vitorpamplona.quartz.nip64Chess.challenge.LiveChessGameChallengeEvent
+import com.vitorpamplona.quartz.nip64Chess.end.LiveChessGameEndEvent
+import com.vitorpamplona.quartz.nip64Chess.move.LiveChessMoveEvent
 import com.vitorpamplona.quartz.nip65RelayList.AdvertisedRelayListEvent
 import com.vitorpamplona.quartz.nip68Picture.PictureEvent
 import com.vitorpamplona.quartz.nip71Video.VideoHorizontalEvent

amethyst/src/main/java/com/vitorpamplona/amethyst/model/nip64Chess/ChessAction.kt

@@ -24,10 +24,10 @@ import com.vitorpamplona.quartz.nip01Core.signers.NostrSigner
 import com.vitorpamplona.quartz.nip64Chess.Color
 import com.vitorpamplona.quartz.nip64Chess.GameResult
 import com.vitorpamplona.quartz.nip64Chess.GameTermination
-import com.vitorpamplona.quartz.nip64Chess.LiveChessGameAcceptEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessGameChallengeEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessGameEndEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessMoveEvent
+import com.vitorpamplona.quartz.nip64Chess.accept.LiveChessGameAcceptEvent
+import com.vitorpamplona.quartz.nip64Chess.challenge.LiveChessGameChallengeEvent
+import com.vitorpamplona.quartz.nip64Chess.end.LiveChessGameEndEvent
+import com.vitorpamplona.quartz.nip64Chess.move.LiveChessMoveEvent
 
 /**
  * Action class for creating and signing live chess events

amethyst/src/main/java/com/vitorpamplona/amethyst/model/topNavFeeds/chess/ChessTopNavFilter.kt

@@ -26,9 +26,9 @@ import com.vitorpamplona.amethyst.model.topNavFeeds.IFeedTopNavFilter
 import com.vitorpamplona.quartz.nip01Core.core.Event
 import com.vitorpamplona.quartz.nip01Core.core.HexKey
 import com.vitorpamplona.quartz.nip01Core.relay.normalizer.NormalizedRelayUrl
-import com.vitorpamplona.quartz.nip64Chess.ChessGameEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessGameChallengeEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessGameEndEvent
+import com.vitorpamplona.quartz.nip64Chess.game.ChessGameEvent
+import com.vitorpamplona.quartz.nip64Chess.challenge.LiveChessGameChallengeEvent
+import com.vitorpamplona.quartz.nip64Chess.end.LiveChessGameEndEvent
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.combine

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/note/NoteCompose.kt

@@ -217,9 +217,9 @@ import com.vitorpamplona.quartz.nip57Zaps.LnZapEvent
 import com.vitorpamplona.quartz.nip57Zaps.splits.hasZapSplitSetup
 import com.vitorpamplona.quartz.nip58Badges.BadgeAwardEvent
 import com.vitorpamplona.quartz.nip58Badges.BadgeDefinitionEvent
-import com.vitorpamplona.quartz.nip64Chess.ChessGameEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessGameChallengeEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessGameEndEvent
+import com.vitorpamplona.quartz.nip64Chess.game.ChessGameEvent
+import com.vitorpamplona.quartz.nip64Chess.challenge.LiveChessGameChallengeEvent
+import com.vitorpamplona.quartz.nip64Chess.end.LiveChessGameEndEvent
 import com.vitorpamplona.quartz.nip65RelayList.AdvertisedRelayListEvent
 import com.vitorpamplona.quartz.nip68Picture.PictureEvent
 import com.vitorpamplona.quartz.nip71Video.VideoHorizontalEvent

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/note/types/Chess.kt

@@ -52,9 +52,9 @@ import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.chess.ChessViewModelFactory
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.chess.ChessViewModelNew
 import com.vitorpamplona.amethyst.ui.stringRes
-import com.vitorpamplona.quartz.nip64Chess.ChessGameEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessGameChallengeEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessGameEndEvent
+import com.vitorpamplona.quartz.nip64Chess.game.ChessGameEvent
+import com.vitorpamplona.quartz.nip64Chess.challenge.LiveChessGameChallengeEvent
+import com.vitorpamplona.quartz.nip64Chess.end.LiveChessGameEndEvent
 import com.vitorpamplona.quartz.nip64Chess.Color as ChessColor
 
 /**

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chess/AndroidChessAdapter.kt

@@ -34,10 +34,10 @@ import com.vitorpamplona.amethyst.model.LocalCache
 import com.vitorpamplona.quartz.nip64Chess.ChessGameEnd
 import com.vitorpamplona.quartz.nip64Chess.ChessMoveEvent
 import com.vitorpamplona.quartz.nip64Chess.Color
-import com.vitorpamplona.quartz.nip64Chess.JesterEvent
-import com.vitorpamplona.quartz.nip64Chess.JesterGameEvents
-import com.vitorpamplona.quartz.nip64Chess.JesterProtocol
-import com.vitorpamplona.quartz.nip64Chess.toJesterEvent
+import com.vitorpamplona.quartz.nip64Chess.jester.JesterEvent
+import com.vitorpamplona.quartz.nip64Chess.jester.JesterGameEvents
+import com.vitorpamplona.quartz.nip64Chess.jester.JesterProtocol
+import com.vitorpamplona.quartz.nip64Chess.jester.toJesterEvent
 
 /**
  * Android implementation of ChessEventPublisher using Jester protocol.

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chess/ChessViewModelNew.kt

@@ -33,9 +33,9 @@ import com.vitorpamplona.amethyst.commons.chess.PublicGame
 import com.vitorpamplona.amethyst.model.Account
 import com.vitorpamplona.quartz.nip01Core.core.Event
 import com.vitorpamplona.quartz.nip64Chess.Color
-import com.vitorpamplona.quartz.nip64Chess.JesterProtocol
+import com.vitorpamplona.quartz.nip64Chess.jester.JesterProtocol
 import com.vitorpamplona.quartz.nip64Chess.LiveChessGameState
-import com.vitorpamplona.quartz.nip64Chess.toJesterEvent
+import com.vitorpamplona.quartz.nip64Chess.jester.toJesterEvent
 import kotlinx.coroutines.flow.StateFlow
 
 /**

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chess/dal/ChessFeedFilter.kt

@@ -26,7 +26,7 @@ import com.vitorpamplona.amethyst.model.Note
 import com.vitorpamplona.amethyst.ui.dal.AdditiveFeedFilter
 import com.vitorpamplona.amethyst.ui.dal.DefaultFeedOrder
 import com.vitorpamplona.amethyst.ui.dal.FilterByListParams
-import com.vitorpamplona.quartz.nip64Chess.ChessGameEvent
+import com.vitorpamplona.quartz.nip64Chess.game.ChessGameEvent
 
 /**
  * Feed filter for NIP-64 Chess Game events (Kind 64)

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/home/dal/HomeNewThreadFeedFilter.kt

@@ -39,9 +39,9 @@ import com.vitorpamplona.quartz.nip18Reposts.RepostEvent
 import com.vitorpamplona.quartz.nip22Comments.CommentEvent
 import com.vitorpamplona.quartz.nip23LongContent.LongTextNoteEvent
 import com.vitorpamplona.quartz.nip54Wiki.WikiNoteEvent
-import com.vitorpamplona.quartz.nip64Chess.ChessGameEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessGameChallengeEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessGameEndEvent
+import com.vitorpamplona.quartz.nip64Chess.game.ChessGameEvent
+import com.vitorpamplona.quartz.nip64Chess.challenge.LiveChessGameChallengeEvent
+import com.vitorpamplona.quartz.nip64Chess.end.LiveChessGameEndEvent
 import com.vitorpamplona.quartz.nip84Highlights.HighlightEvent
 import com.vitorpamplona.quartz.nip88Polls.poll.PollEvent
 import com.vitorpamplona.quartz.nip99Classifieds.ClassifiedsEvent

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/home/datasource/nip64Chess/FilterHomePostsByChess.kt

@@ -24,9 +24,9 @@ import com.vitorpamplona.amethyst.model.topNavFeeds.chess.ChessTopNavPerRelayFil
 import com.vitorpamplona.amethyst.service.relays.SincePerRelayMap
 import com.vitorpamplona.quartz.nip01Core.relay.client.pool.RelayBasedFilter
 import com.vitorpamplona.quartz.nip01Core.relay.filters.Filter
-import com.vitorpamplona.quartz.nip64Chess.ChessGameEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessGameChallengeEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessGameEndEvent
+import com.vitorpamplona.quartz.nip64Chess.game.ChessGameEvent
+import com.vitorpamplona.quartz.nip64Chess.challenge.LiveChessGameChallengeEvent
+import com.vitorpamplona.quartz.nip64Chess.end.LiveChessGameEndEvent
 
 val ChessPostsKinds =
     listOf(

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/home/datasource/nip65Follows/FilterHomePostsByAuthors.kt

@@ -39,9 +39,9 @@ import com.vitorpamplona.quartz.nip23LongContent.LongTextNoteEvent
 import com.vitorpamplona.quartz.nip53LiveActivities.chat.LiveActivitiesChatMessageEvent
 import com.vitorpamplona.quartz.nip53LiveActivities.streaming.LiveActivitiesEvent
 import com.vitorpamplona.quartz.nip54Wiki.WikiNoteEvent
-import com.vitorpamplona.quartz.nip64Chess.ChessGameEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessGameChallengeEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessGameEndEvent
+import com.vitorpamplona.quartz.nip64Chess.game.ChessGameEvent
+import com.vitorpamplona.quartz.nip64Chess.challenge.LiveChessGameChallengeEvent
+import com.vitorpamplona.quartz.nip64Chess.end.LiveChessGameEndEvent
 import com.vitorpamplona.quartz.nip84Highlights.HighlightEvent
 import com.vitorpamplona.quartz.nip88Polls.poll.PollEvent
 import com.vitorpamplona.quartz.nip88Polls.response.PollResponseEvent

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/relays/RelayInformationScreen.kt

@@ -221,13 +221,13 @@ import com.vitorpamplona.quartz.nip58Badges.BadgeProfilesEvent
 import com.vitorpamplona.quartz.nip59Giftwrap.seals.SealedRumorEvent
 import com.vitorpamplona.quartz.nip59Giftwrap.wraps.GiftWrapEvent
 import com.vitorpamplona.quartz.nip62RequestToVanish.RequestToVanishEvent
-import com.vitorpamplona.quartz.nip64Chess.ChessGameEvent
-import com.vitorpamplona.quartz.nip64Chess.JesterEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessDrawOfferEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessGameAcceptEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessGameChallengeEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessGameEndEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessMoveEvent
+import com.vitorpamplona.quartz.nip64Chess.game.ChessGameEvent
+import com.vitorpamplona.quartz.nip64Chess.jester.JesterEvent
+import com.vitorpamplona.quartz.nip64Chess.draw.LiveChessDrawOfferEvent
+import com.vitorpamplona.quartz.nip64Chess.accept.LiveChessGameAcceptEvent
+import com.vitorpamplona.quartz.nip64Chess.challenge.LiveChessGameChallengeEvent
+import com.vitorpamplona.quartz.nip64Chess.end.LiveChessGameEndEvent
+import com.vitorpamplona.quartz.nip64Chess.move.LiveChessMoveEvent
 import com.vitorpamplona.quartz.nip65RelayList.AdvertisedRelayListEvent
 import com.vitorpamplona.quartz.nip66RelayMonitor.discovery.RelayDiscoveryEvent
 import com.vitorpamplona.quartz.nip66RelayMonitor.monitor.RelayMonitorEvent

commons/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/chess/ChessEventCollector.kt

@@ -21,10 +21,10 @@
 package com.vitorpamplona.amethyst.commons.chess
 
 import com.vitorpamplona.quartz.nip01Core.core.Event
-import com.vitorpamplona.quartz.nip64Chess.JesterEvent
-import com.vitorpamplona.quartz.nip64Chess.JesterGameEvents
-import com.vitorpamplona.quartz.nip64Chess.JesterProtocol
-import com.vitorpamplona.quartz.nip64Chess.toJesterEvent
+import com.vitorpamplona.quartz.nip64Chess.jester.JesterEvent
+import com.vitorpamplona.quartz.nip64Chess.jester.JesterGameEvents
+import com.vitorpamplona.quartz.nip64Chess.jester.JesterProtocol
+import com.vitorpamplona.quartz.nip64Chess.jester.toJesterEvent
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow

commons/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/chess/ChessGameLoader.kt

@@ -23,7 +23,7 @@ package com.vitorpamplona.amethyst.commons.chess
 import com.vitorpamplona.quartz.nip64Chess.ChessEngine
 import com.vitorpamplona.quartz.nip64Chess.ChessStateReconstructor
 import com.vitorpamplona.quartz.nip64Chess.Color
-import com.vitorpamplona.quartz.nip64Chess.JesterGameEvents
+import com.vitorpamplona.quartz.nip64Chess.jester.JesterGameEvents
 import com.vitorpamplona.quartz.nip64Chess.LiveChessGameState
 import com.vitorpamplona.quartz.nip64Chess.ReconstructedGameState
 import com.vitorpamplona.quartz.nip64Chess.ReconstructionResult

commons/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/chess/ChessLobbyLogic.kt

@@ -23,8 +23,8 @@ package com.vitorpamplona.amethyst.commons.chess
 import com.vitorpamplona.quartz.nip64Chess.ChessGameEnd
 import com.vitorpamplona.quartz.nip64Chess.ChessMoveEvent
 import com.vitorpamplona.quartz.nip64Chess.Color
-import com.vitorpamplona.quartz.nip64Chess.JesterEvent
-import com.vitorpamplona.quartz.nip64Chess.JesterGameEvents
+import com.vitorpamplona.quartz.nip64Chess.jester.JesterEvent
+import com.vitorpamplona.quartz.nip64Chess.jester.JesterGameEvents
 import com.vitorpamplona.quartz.nip64Chess.PieceType
 import com.vitorpamplona.quartz.utils.TimeUtils
 import kotlinx.coroutines.CoroutineScope

commons/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/chess/subscription/ChessFilterBuilder.kt

@@ -23,7 +23,7 @@ package com.vitorpamplona.amethyst.commons.chess.subscription
 import com.vitorpamplona.quartz.nip01Core.relay.client.pool.RelayBasedFilter
 import com.vitorpamplona.quartz.nip01Core.relay.filters.Filter
 import com.vitorpamplona.quartz.nip01Core.relay.normalizer.NormalizedRelayUrl
-import com.vitorpamplona.quartz.nip64Chess.JesterProtocol
+import com.vitorpamplona.quartz.nip64Chess.jester.JesterProtocol
 import com.vitorpamplona.quartz.utils.TimeUtils
 
 /**

commons/src/jvmAndroid/kotlin/com/vitorpamplona/amethyst/commons/chess/ChessEventBroadcaster.kt

@@ -27,7 +27,7 @@ import com.vitorpamplona.quartz.nip01Core.relay.client.reqs.IRequestListener
 import com.vitorpamplona.quartz.nip01Core.relay.client.single.newSubId
 import com.vitorpamplona.quartz.nip01Core.relay.filters.Filter
 import com.vitorpamplona.quartz.nip01Core.relay.normalizer.NormalizedRelayUrl
-import com.vitorpamplona.quartz.nip64Chess.JesterProtocol
+import com.vitorpamplona.quartz.nip64Chess.jester.JesterProtocol
 import kotlinx.coroutines.delay
 
 /**

desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/chess/DesktopChessAdapter.kt

@@ -37,10 +37,10 @@ import com.vitorpamplona.quartz.nip01Core.relay.normalizer.NormalizedRelayUrl
 import com.vitorpamplona.quartz.nip64Chess.ChessGameEnd
 import com.vitorpamplona.quartz.nip64Chess.ChessMoveEvent
 import com.vitorpamplona.quartz.nip64Chess.Color
-import com.vitorpamplona.quartz.nip64Chess.JesterEvent
-import com.vitorpamplona.quartz.nip64Chess.JesterGameEvents
-import com.vitorpamplona.quartz.nip64Chess.JesterProtocol
-import com.vitorpamplona.quartz.nip64Chess.toJesterEvent
+import com.vitorpamplona.quartz.nip64Chess.jester.JesterEvent
+import com.vitorpamplona.quartz.nip64Chess.jester.JesterGameEvents
+import com.vitorpamplona.quartz.nip64Chess.jester.JesterProtocol
+import com.vitorpamplona.quartz.nip64Chess.jester.toJesterEvent
 
 /**
  * Desktop implementation of ChessEventPublisher using Jester protocol.

desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/chess/DesktopChessEventCache.kt

@@ -21,10 +21,10 @@
 package com.vitorpamplona.amethyst.desktop.chess
 
 import com.vitorpamplona.quartz.nip01Core.core.Event
-import com.vitorpamplona.quartz.nip64Chess.JesterEvent
-import com.vitorpamplona.quartz.nip64Chess.JesterGameEvents
-import com.vitorpamplona.quartz.nip64Chess.JesterProtocol
-import com.vitorpamplona.quartz.nip64Chess.toJesterEvent
+import com.vitorpamplona.quartz.nip64Chess.jester.JesterEvent
+import com.vitorpamplona.quartz.nip64Chess.jester.JesterGameEvents
+import com.vitorpamplona.quartz.nip64Chess.jester.JesterProtocol
+import com.vitorpamplona.quartz.nip64Chess.jester.toJesterEvent
 import java.util.concurrent.ConcurrentHashMap
 
 /**

desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/chess/DesktopChessViewModelNew.kt

@@ -32,9 +32,9 @@ import com.vitorpamplona.amethyst.desktop.account.AccountState
 import com.vitorpamplona.amethyst.desktop.network.DesktopRelayConnectionManager
 import com.vitorpamplona.quartz.nip01Core.core.Event
 import com.vitorpamplona.quartz.nip64Chess.Color
-import com.vitorpamplona.quartz.nip64Chess.JesterProtocol
+import com.vitorpamplona.quartz.nip64Chess.jester.JesterProtocol
 import com.vitorpamplona.quartz.nip64Chess.LiveChessGameState
-import com.vitorpamplona.quartz.nip64Chess.toJesterEvent
+import com.vitorpamplona.quartz.nip64Chess.jester.toJesterEvent
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.flow.StateFlow
 

desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/subscriptions/ChessSubscription.kt

@@ -30,11 +30,11 @@ import com.vitorpamplona.quartz.nip01Core.relay.client.pool.groupByRelay
 import com.vitorpamplona.quartz.nip01Core.relay.client.reqs.IRequestListener
 import com.vitorpamplona.quartz.nip01Core.relay.filters.Filter
 import com.vitorpamplona.quartz.nip01Core.relay.normalizer.NormalizedRelayUrl
-import com.vitorpamplona.quartz.nip64Chess.LiveChessDrawOfferEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessGameAcceptEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessGameChallengeEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessGameEndEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessMoveEvent
+import com.vitorpamplona.quartz.nip64Chess.draw.LiveChessDrawOfferEvent
+import com.vitorpamplona.quartz.nip64Chess.accept.LiveChessGameAcceptEvent
+import com.vitorpamplona.quartz.nip64Chess.challenge.LiveChessGameChallengeEvent
+import com.vitorpamplona.quartz.nip64Chess.end.LiveChessGameEndEvent
+import com.vitorpamplona.quartz.nip64Chess.move.LiveChessMoveEvent
 import com.vitorpamplona.quartz.utils.TimeUtils
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip64Chess/ChessStateReconstructor.kt

@@ -21,6 +21,9 @@
 package com.vitorpamplona.quartz.nip64Chess
 
 import androidx.compose.runtime.Immutable
+import com.vitorpamplona.quartz.nip64Chess.jester.JesterEvent
+import com.vitorpamplona.quartz.nip64Chess.jester.JesterGameEvents
+import com.vitorpamplona.quartz.nip64Chess.jester.JesterProtocol
 
 /**
  * Deterministic chess state reconstruction from Jester protocol events.

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip64Chess/LiveChessGameEvents.kt

@@ -1,295 +0,0 @@
-/*
- * Copyright (c) 2025 Vitor Pamplona
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy of
- * this software and associated documentation files (the "Software"), to deal in
- * the Software without restriction, including without limitation the rights to use,
- * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
- * Software, and to permit persons to whom the Software is furnished to do so,
- * subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all
- * copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
- * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
- * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
- * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
- * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
-package com.vitorpamplona.quartz.nip64Chess
-
-import androidx.compose.runtime.Immutable
-import com.vitorpamplona.quartz.nip01Core.core.BaseAddressableEvent
-import com.vitorpamplona.quartz.nip01Core.core.HexKey
-import com.vitorpamplona.quartz.nip01Core.core.TagArrayBuilder
-import com.vitorpamplona.quartz.nip01Core.signers.eventTemplate
-import com.vitorpamplona.quartz.nip31Alts.alt
-import com.vitorpamplona.quartz.utils.TimeUtils
-
-/**
- * Live Chess Game Challenge Event (Kind 30064)
- *
- * Challenge another player to a chess game or create an open challenge.
- * This is a parameterized replaceable event.
- *
- * Tags:
- * - d: game_id (unique identifier for this game)
- * - p: opponent pubkey (optional, for direct challenges)
- * - player_color: "white" or "black"
- * - time_control: optional time control (e.g., "10+0", "5+3")
- */
-@Immutable
-class LiveChessGameChallengeEvent(
-    id: HexKey,
-    pubKey: HexKey,
-    createdAt: Long,
-    tags: Array<Array<String>>,
-    content: String,
-    sig: HexKey,
-) : BaseAddressableEvent(id, pubKey, createdAt, KIND, tags, content, sig) {
-    companion object {
-        const val KIND = 30064
-
-        fun build(
-            gameId: String,
-            playerColor: Color,
-            opponentPubkey: String? = null,
-            timeControl: String? = null,
-            createdAt: Long = TimeUtils.now(),
-            initializer: TagArrayBuilder<LiveChessGameChallengeEvent>.() -> Unit = {},
-        ) = eventTemplate(KIND, "", createdAt) {
-            add(arrayOf("d", gameId))
-            add(arrayOf("player_color", if (playerColor == Color.WHITE) "white" else "black"))
-            opponentPubkey?.let { add(arrayOf("p", it)) }
-            timeControl?.let { add(arrayOf("time_control", it)) }
-            alt("Chess game challenge")
-            initializer()
-        }
-    }
-
-    fun gameId(): String? = tags.firstOrNull { it.size >= 2 && it[0] == "d" }?.get(1)
-
-    fun playerColor(): Color? =
-        tags
-            .firstOrNull { it.size >= 2 && it[0] == "player_color" }
-            ?.get(1)
-            ?.let { if (it == "white") Color.WHITE else Color.BLACK }
-
-    fun opponentPubkey(): String? = tags.firstOrNull { it.size >= 2 && it[0] == "p" }?.get(1)
-
-    fun timeControl(): String? = tags.firstOrNull { it.size >= 2 && it[0] == "time_control" }?.get(1)
-}
-
-/**
- * Live Chess Game Accept Event (Kind 30065)
- *
- * Accept a chess game challenge
- *
- * Tags:
- * - d: game_id (same as challenge)
- * - e: challenge event ID
- * - p: challenger pubkey
- */
-@Immutable
-class LiveChessGameAcceptEvent(
-    id: HexKey,
-    pubKey: HexKey,
-    createdAt: Long,
-    tags: Array<Array<String>>,
-    content: String,
-    sig: HexKey,
-) : BaseAddressableEvent(id, pubKey, createdAt, KIND, tags, content, sig) {
-    companion object {
-        const val KIND = 30065
-
-        fun build(
-            gameId: String,
-            challengeEventId: String,
-            challengerPubkey: String,
-            createdAt: Long = TimeUtils.now(),
-            initializer: TagArrayBuilder<LiveChessGameAcceptEvent>.() -> Unit = {},
-        ) = eventTemplate(KIND, "", createdAt) {
-            add(arrayOf("d", gameId))
-            add(arrayOf("e", challengeEventId))
-            add(arrayOf("p", challengerPubkey))
-            alt("Chess game acceptance")
-            initializer()
-        }
-    }
-
-    fun gameId(): String? = tags.firstOrNull { it.size >= 2 && it[0] == "d" }?.get(1)
-
-    fun challengeEventId(): String? = tags.firstOrNull { it.size >= 2 && it[0] == "e" }?.get(1)
-
-    fun challengerPubkey(): String? = tags.firstOrNull { it.size >= 2 && it[0] == "p" }?.get(1)
-}
-
-/**
- * Live Chess Move Event (Kind 30066)
- *
- * Individual move in a live chess game
- *
- * Tags:
- * - d: game_id
- * - move_number: move number (1-based)
- * - san: move in Standard Algebraic Notation
- * - fen: resulting position in FEN notation
- * - p: opponent pubkey
- *
- * Content: Optional move comment
- */
-@Immutable
-class LiveChessMoveEvent(
-    id: HexKey,
-    pubKey: HexKey,
-    createdAt: Long,
-    tags: Array<Array<String>>,
-    content: String,
-    sig: HexKey,
-) : BaseAddressableEvent(id, pubKey, createdAt, KIND, tags, content, sig) {
-    companion object {
-        const val KIND = 30066
-
-        fun build(
-            gameId: String,
-            moveNumber: Int,
-            san: String,
-            fen: String,
-            opponentPubkey: String,
-            comment: String = "",
-            createdAt: Long = TimeUtils.now(),
-            initializer: TagArrayBuilder<LiveChessMoveEvent>.() -> Unit = {},
-        ) = eventTemplate(KIND, comment, createdAt) {
-            add(arrayOf("d", "$gameId-$moveNumber"))
-            add(arrayOf("game_id", gameId))
-            add(arrayOf("move_number", moveNumber.toString()))
-            add(arrayOf("san", san))
-            add(arrayOf("fen", fen))
-            add(arrayOf("p", opponentPubkey))
-            alt("Chess move: $san")
-            initializer()
-        }
-    }
-
-    fun gameId(): String? = tags.firstOrNull { it.size >= 2 && it[0] == "game_id" }?.get(1)
-
-    fun moveNumber(): Int? =
-        tags
-            .firstOrNull { it.size >= 2 && it[0] == "move_number" }
-            ?.get(1)
-            ?.toIntOrNull()
-
-    fun san(): String? = tags.firstOrNull { it.size >= 2 && it[0] == "san" }?.get(1)
-
-    fun fen(): String? = tags.firstOrNull { it.size >= 2 && it[0] == "fen" }?.get(1)
-
-    fun opponentPubkey(): String? = tags.firstOrNull { it.size >= 2 && it[0] == "p" }?.get(1)
-
-    fun comment(): String = content
-}
-
-/**
- * Live Chess Game End Event (Kind 30067)
- *
- * Game result and termination
- *
- * Tags:
- * - d: game_id
- * - result: "1-0"|"0-1"|"1/2-1/2"
- * - termination: reason for game end
- * - winner: pubkey of winner (if applicable)
- * - p: opponent pubkey
- *
- * Content: Optional PGN of complete game
- */
-@Immutable
-class LiveChessGameEndEvent(
-    id: HexKey,
-    pubKey: HexKey,
-    createdAt: Long,
-    tags: Array<Array<String>>,
-    content: String,
-    sig: HexKey,
-) : BaseAddressableEvent(id, pubKey, createdAt, KIND, tags, content, sig) {
-    companion object {
-        const val KIND = 30067
-
-        fun build(
-            gameId: String,
-            result: GameResult,
-            termination: GameTermination,
-            winnerPubkey: String? = null,
-            opponentPubkey: String,
-            pgn: String = "",
-            createdAt: Long = TimeUtils.now(),
-            initializer: TagArrayBuilder<LiveChessGameEndEvent>.() -> Unit = {},
-        ) = eventTemplate(KIND, pgn, createdAt) {
-            add(arrayOf("d", gameId))
-            add(arrayOf("result", result.notation))
-            add(arrayOf("termination", termination.name.lowercase()))
-            winnerPubkey?.let { add(arrayOf("winner", it)) }
-            add(arrayOf("p", opponentPubkey))
-            alt("Chess game ended: ${result.notation}")
-            initializer()
-        }
-    }
-
-    fun gameId(): String? = tags.firstOrNull { it.size >= 2 && it[0] == "d" }?.get(1)
-
-    fun result(): String? = tags.firstOrNull { it.size >= 2 && it[0] == "result" }?.get(1)
-
-    fun termination(): String? = tags.firstOrNull { it.size >= 2 && it[0] == "termination" }?.get(1)
-
-    fun winnerPubkey(): String? = tags.firstOrNull { it.size >= 2 && it[0] == "winner" }?.get(1)
-
-    fun opponentPubkey(): String? = tags.firstOrNull { it.size >= 2 && it[0] == "p" }?.get(1)
-
-    fun pgn(): String = content
-}
-
-/**
- * Live Chess Draw Offer Event (Kind 30068)
- *
- * Offer a draw to opponent. Opponent can accept by sending a game end event
- * with DRAW_AGREEMENT termination, or decline/ignore by making their next move.
- *
- * Tags:
- * - d: game_id
- * - p: opponent pubkey
- *
- * Content: Optional message
- */
-@Immutable
-class LiveChessDrawOfferEvent(
-    id: HexKey,
-    pubKey: HexKey,
-    createdAt: Long,
-    tags: Array<Array<String>>,
-    content: String,
-    sig: HexKey,
-) : BaseAddressableEvent(id, pubKey, createdAt, KIND, tags, content, sig) {
-    companion object {
-        const val KIND = 30068
-
-        fun build(
-            gameId: String,
-            opponentPubkey: String,
-            message: String = "",
-            createdAt: Long = TimeUtils.now(),
-            initializer: TagArrayBuilder<LiveChessDrawOfferEvent>.() -> Unit = {},
-        ) = eventTemplate(KIND, message, createdAt) {
-            add(arrayOf("d", gameId))
-            add(arrayOf("p", opponentPubkey))
-            alt("Chess draw offer")
-            initializer()
-        }
-    }
-
-    fun gameId(): String? = tags.firstOrNull { it.size >= 2 && it[0] == "d" }?.get(1)
-
-    fun opponentPubkey(): String? = tags.firstOrNull { it.size >= 2 && it[0] == "p" }?.get(1)
-
-    fun message(): String = content
-}

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip64Chess/accept/LiveChessGameAcceptEvent.kt

@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nip64Chess.accept
+
+import androidx.compose.runtime.Immutable
+import com.vitorpamplona.quartz.nip01Core.core.BaseAddressableEvent
+import com.vitorpamplona.quartz.nip01Core.core.HexKey
+import com.vitorpamplona.quartz.nip01Core.core.TagArrayBuilder
+import com.vitorpamplona.quartz.nip01Core.signers.eventTemplate
+import com.vitorpamplona.quartz.nip31Alts.alt
+import com.vitorpamplona.quartz.utils.TimeUtils
+
+/**
+ * Live Chess Game Accept Event (Kind 30065)
+ *
+ * Accept a chess game challenge
+ *
+ * Tags:
+ * - d: game_id (same as challenge)
+ * - e: challenge event ID
+ * - p: challenger pubkey
+ */
+@Immutable
+class LiveChessGameAcceptEvent(
+    id: HexKey,
+    pubKey: HexKey,
+    createdAt: Long,
+    tags: Array<Array<String>>,
+    content: String,
+    sig: HexKey,
+) : BaseAddressableEvent(id, pubKey, createdAt, KIND, tags, content, sig) {
+    fun challengeEventId() = tags.challengeEventId()
+
+    fun challengerPubkey(): String? = tags.firstOrNull { it.size >= 2 && it[0] == "p" }?.get(1)
+
+    companion object {
+        const val KIND = 30065
+        const val ALT_DESCRIPTION = "Chess game acceptance"
+
+        fun build(
+            gameId: String,
+            challengeEventId: String,
+            challengerPubkey: String,
+            createdAt: Long = TimeUtils.now(),
+            initializer: TagArrayBuilder<LiveChessGameAcceptEvent>.() -> Unit = {},
+        ) = eventTemplate(KIND, "", createdAt) {
+            add(arrayOf("d", gameId))
+            challengeEvent(challengeEventId)
+            add(arrayOf("p", challengerPubkey))
+            alt(ALT_DESCRIPTION)
+            initializer()
+        }
+    }
+}

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip64Chess/accept/TagArrayBuilderExt.kt

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nip64Chess.accept
+
+import com.vitorpamplona.quartz.nip01Core.core.TagArrayBuilder
+import com.vitorpamplona.quartz.nip64Chess.accept.tags.ChallengeEventTag
+
+fun TagArrayBuilder<LiveChessGameAcceptEvent>.challengeEvent(challengeEventId: String) = add(ChallengeEventTag.assemble(challengeEventId))

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip64Chess/accept/TagArrayExt.kt

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nip64Chess.accept
+
+import com.vitorpamplona.quartz.nip01Core.core.TagArray
+import com.vitorpamplona.quartz.nip64Chess.accept.tags.ChallengeEventTag
+
+fun TagArray.challengeEventId() = firstNotNullOfOrNull(ChallengeEventTag::parse)

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip64Chess/accept/tags/ChallengeEventTag.kt

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nip64Chess.accept.tags
+
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.utils.ensure
+
+class ChallengeEventTag {
+    companion object {
+        const val TAG_NAME = "e"
+
+        fun isTag(tag: Array<String>) = tag.has(1) && tag[0] == TAG_NAME && tag[1].length == 64
+
+        fun parse(tag: Array<String>): String? {
+            ensure(tag.has(1) && tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].length == 64) { return null }
+            return tag[1]
+        }
+
+        fun assemble(challengeEventId: String) = arrayOf(TAG_NAME, challengeEventId)
+    }
+}

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip64Chess/challenge/LiveChessGameChallengeEvent.kt

@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nip64Chess.challenge
+
+import androidx.compose.runtime.Immutable
+import com.vitorpamplona.quartz.nip01Core.core.BaseAddressableEvent
+import com.vitorpamplona.quartz.nip01Core.core.HexKey
+import com.vitorpamplona.quartz.nip01Core.core.TagArrayBuilder
+import com.vitorpamplona.quartz.nip01Core.signers.eventTemplate
+import com.vitorpamplona.quartz.nip31Alts.alt
+import com.vitorpamplona.quartz.nip64Chess.Color
+import com.vitorpamplona.quartz.utils.TimeUtils
+
+/**
+ * Live Chess Game Challenge Event (Kind 30064)
+ *
+ * Challenge another player to a chess game or create an open challenge.
+ * This is a parameterized replaceable event.
+ *
+ * Tags:
+ * - d: game_id (unique identifier for this game)
+ * - p: opponent pubkey (optional, for direct challenges)
+ * - player_color: "white" or "black"
+ * - time_control: optional time control (e.g., "10+0", "5+3")
+ */
+@Immutable
+class LiveChessGameChallengeEvent(
+    id: HexKey,
+    pubKey: HexKey,
+    createdAt: Long,
+    tags: Array<Array<String>>,
+    content: String,
+    sig: HexKey,
+) : BaseAddressableEvent(id, pubKey, createdAt, KIND, tags, content, sig) {
+    fun playerColor() = tags.playerColor()
+
+    fun timeControl() = tags.timeControl()
+
+    fun opponentPubkey(): String? = tags.firstOrNull { it.size >= 2 && it[0] == "p" }?.get(1)
+
+    companion object {
+        const val KIND = 30064
+        const val ALT_DESCRIPTION = "Chess game challenge"
+
+        fun build(
+            gameId: String,
+            playerColor: Color,
+            opponentPubkey: String? = null,
+            timeControl: String? = null,
+            createdAt: Long = TimeUtils.now(),
+            initializer: TagArrayBuilder<LiveChessGameChallengeEvent>.() -> Unit = {},
+        ) = eventTemplate(KIND, "", createdAt) {
+            add(arrayOf("d", gameId))
+            playerColor(playerColor)
+            opponentPubkey?.let { add(arrayOf("p", it)) }
+            timeControl?.let { timeControl(it) }
+            alt(ALT_DESCRIPTION)
+            initializer()
+        }
+    }
+}

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip64Chess/challenge/TagArrayBuilderExt.kt

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nip64Chess.challenge
+
+import com.vitorpamplona.quartz.nip01Core.core.TagArrayBuilder
+import com.vitorpamplona.quartz.nip64Chess.Color
+import com.vitorpamplona.quartz.nip64Chess.challenge.tags.PlayerColorTag
+import com.vitorpamplona.quartz.nip64Chess.challenge.tags.TimeControlTag
+
+fun TagArrayBuilder<LiveChessGameChallengeEvent>.playerColor(color: Color) = addUnique(PlayerColorTag.assemble(color))
+
+fun TagArrayBuilder<LiveChessGameChallengeEvent>.timeControl(timeControl: String) = addUnique(TimeControlTag.assemble(timeControl))

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip64Chess/challenge/TagArrayExt.kt

@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nip64Chess.challenge
+
+import com.vitorpamplona.quartz.nip01Core.core.TagArray
+import com.vitorpamplona.quartz.nip64Chess.challenge.tags.PlayerColorTag
+import com.vitorpamplona.quartz.nip64Chess.challenge.tags.TimeControlTag
+
+fun TagArray.playerColor() = firstNotNullOfOrNull(PlayerColorTag::parse)
+
+fun TagArray.timeControl() = firstNotNullOfOrNull(TimeControlTag::parse)

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip64Chess/challenge/tags/PlayerColorTag.kt

@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nip64Chess.challenge.tags
+
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.nip64Chess.Color
+import com.vitorpamplona.quartz.utils.ensure
+
+class PlayerColorTag {
+    companion object {
+        const val TAG_NAME = "player_color"
+
+        fun isTag(tag: Array<String>) = tag.has(1) && tag[0] == TAG_NAME && tag[1].isNotEmpty()
+
+        fun parse(tag: Array<String>): Color? {
+            ensure(tag.has(1) && tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].isNotEmpty()) { return null }
+            return when (tag[1]) {
+                "white" -> Color.WHITE
+                "black" -> Color.BLACK
+                else -> null
+            }
+        }
+
+        fun assemble(color: Color) = arrayOf(TAG_NAME, if (color == Color.WHITE) "white" else "black")
+    }
+}

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip64Chess/challenge/tags/TimeControlTag.kt

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nip64Chess.challenge.tags
+
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.utils.ensure
+
+class TimeControlTag {
+    companion object {
+        const val TAG_NAME = "time_control"
+
+        fun isTag(tag: Array<String>) = tag.has(1) && tag[0] == TAG_NAME && tag[1].isNotEmpty()
+
+        fun parse(tag: Array<String>): String? {
+            ensure(tag.has(1) && tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].isNotEmpty()) { return null }
+            return tag[1]
+        }
+
+        fun assemble(timeControl: String) = arrayOf(TAG_NAME, timeControl)
+    }
+}

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip64Chess/draw/LiveChessDrawOfferEvent.kt

@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nip64Chess.draw
+
+import androidx.compose.runtime.Immutable
+import com.vitorpamplona.quartz.nip01Core.core.BaseAddressableEvent
+import com.vitorpamplona.quartz.nip01Core.core.HexKey
+import com.vitorpamplona.quartz.nip01Core.core.TagArrayBuilder
+import com.vitorpamplona.quartz.nip01Core.signers.eventTemplate
+import com.vitorpamplona.quartz.nip31Alts.alt
+import com.vitorpamplona.quartz.utils.TimeUtils
+
+/**
+ * Live Chess Draw Offer Event (Kind 30068)
+ *
+ * Offer a draw to opponent. Opponent can accept by sending a game end event
+ * with DRAW_AGREEMENT termination, or decline/ignore by making their next move.
+ *
+ * Tags:
+ * - d: game_id
+ * - p: opponent pubkey
+ *
+ * Content: Optional message
+ */
+@Immutable
+class LiveChessDrawOfferEvent(
+    id: HexKey,
+    pubKey: HexKey,
+    createdAt: Long,
+    tags: Array<Array<String>>,
+    content: String,
+    sig: HexKey,
+) : BaseAddressableEvent(id, pubKey, createdAt, KIND, tags, content, sig) {
+    fun opponentPubkey(): String? = tags.firstOrNull { it.size >= 2 && it[0] == "p" }?.get(1)
+
+    fun message(): String = content
+
+    companion object {
+        const val KIND = 30068
+        const val ALT_DESCRIPTION = "Chess draw offer"
+
+        fun build(
+            gameId: String,
+            opponentPubkey: String,
+            message: String = "",
+            createdAt: Long = TimeUtils.now(),
+            initializer: TagArrayBuilder<LiveChessDrawOfferEvent>.() -> Unit = {},
+        ) = eventTemplate(KIND, message, createdAt) {
+            add(arrayOf("d", gameId))
+            add(arrayOf("p", opponentPubkey))
+            alt(ALT_DESCRIPTION)
+            initializer()
+        }
+    }
+}

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip64Chess/end/LiveChessGameEndEvent.kt

@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nip64Chess.end
+
+import androidx.compose.runtime.Immutable
+import com.vitorpamplona.quartz.nip01Core.core.BaseAddressableEvent
+import com.vitorpamplona.quartz.nip01Core.core.HexKey
+import com.vitorpamplona.quartz.nip01Core.core.TagArrayBuilder
+import com.vitorpamplona.quartz.nip01Core.signers.eventTemplate
+import com.vitorpamplona.quartz.nip31Alts.alt
+import com.vitorpamplona.quartz.nip64Chess.GameResult
+import com.vitorpamplona.quartz.nip64Chess.GameTermination
+import com.vitorpamplona.quartz.utils.TimeUtils
+
+/**
+ * Live Chess Game End Event (Kind 30067)
+ *
+ * Game result and termination
+ *
+ * Tags:
+ * - d: game_id
+ * - result: "1-0"|"0-1"|"1/2-1/2"
+ * - termination: reason for game end
+ * - winner: pubkey of winner (if applicable)
+ * - p: opponent pubkey
+ *
+ * Content: Optional PGN of complete game
+ */
+@Immutable
+class LiveChessGameEndEvent(
+    id: HexKey,
+    pubKey: HexKey,
+    createdAt: Long,
+    tags: Array<Array<String>>,
+    content: String,
+    sig: HexKey,
+) : BaseAddressableEvent(id, pubKey, createdAt, KIND, tags, content, sig) {
+    fun result() = tags.result()
+
+    fun termination() = tags.termination()
+
+    fun winnerPubkey() = tags.winnerPubkey()
+
+    fun opponentPubkey(): String? = tags.firstOrNull { it.size >= 2 && it[0] == "p" }?.get(1)
+
+    fun pgn(): String = content
+
+    companion object {
+        const val KIND = 30067
+        const val ALT_DESCRIPTION = "Chess game ended"
+
+        fun build(
+            gameId: String,
+            result: GameResult,
+            termination: GameTermination,
+            winnerPubkey: String? = null,
+            opponentPubkey: String,
+            pgn: String = "",
+            createdAt: Long = TimeUtils.now(),
+            initializer: TagArrayBuilder<LiveChessGameEndEvent>.() -> Unit = {},
+        ) = eventTemplate(KIND, pgn, createdAt) {
+            add(arrayOf("d", gameId))
+            result(result)
+            termination(termination)
+            winnerPubkey?.let { winner(it) }
+            add(arrayOf("p", opponentPubkey))
+            alt("$ALT_DESCRIPTION: ${result.notation}")
+            initializer()
+        }
+    }
+}

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip64Chess/end/TagArrayBuilderExt.kt

@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nip64Chess.end
+
+import com.vitorpamplona.quartz.nip01Core.core.HexKey
+import com.vitorpamplona.quartz.nip01Core.core.TagArrayBuilder
+import com.vitorpamplona.quartz.nip64Chess.GameResult
+import com.vitorpamplona.quartz.nip64Chess.GameTermination
+import com.vitorpamplona.quartz.nip64Chess.end.tags.ResultTag
+import com.vitorpamplona.quartz.nip64Chess.end.tags.TerminationTag
+import com.vitorpamplona.quartz.nip64Chess.end.tags.WinnerTag
+
+fun TagArrayBuilder<LiveChessGameEndEvent>.result(result: GameResult) = addUnique(ResultTag.assemble(result))
+
+fun TagArrayBuilder<LiveChessGameEndEvent>.termination(termination: GameTermination) = addUnique(TerminationTag.assemble(termination))
+
+fun TagArrayBuilder<LiveChessGameEndEvent>.winner(winnerPubkey: HexKey) = addUnique(WinnerTag.assemble(winnerPubkey))

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip64Chess/end/TagArrayExt.kt

@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nip64Chess.end
+
+import com.vitorpamplona.quartz.nip01Core.core.TagArray
+import com.vitorpamplona.quartz.nip64Chess.end.tags.ResultTag
+import com.vitorpamplona.quartz.nip64Chess.end.tags.TerminationTag
+import com.vitorpamplona.quartz.nip64Chess.end.tags.WinnerTag
+
+fun TagArray.result() = firstNotNullOfOrNull(ResultTag::parse)
+
+fun TagArray.termination() = firstNotNullOfOrNull(TerminationTag::parse)
+
+fun TagArray.winnerPubkey() = firstNotNullOfOrNull(WinnerTag::parse)

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip64Chess/end/tags/ResultTag.kt

@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nip64Chess.end.tags
+
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.nip64Chess.GameResult
+import com.vitorpamplona.quartz.utils.ensure
+
+class ResultTag {
+    companion object {
+        const val TAG_NAME = "result"
+
+        fun isTag(tag: Array<String>) = tag.has(1) && tag[0] == TAG_NAME && tag[1].isNotEmpty()
+
+        fun parse(tag: Array<String>): String? {
+            ensure(tag.has(1) && tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].isNotEmpty()) { return null }
+            return tag[1]
+        }
+
+        fun assemble(result: GameResult) = arrayOf(TAG_NAME, result.notation)
+    }
+}

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip64Chess/end/tags/TerminationTag.kt

@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nip64Chess.end.tags
+
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.nip64Chess.GameTermination
+import com.vitorpamplona.quartz.utils.ensure
+
+class TerminationTag {
+    companion object {
+        const val TAG_NAME = "termination"
+
+        fun isTag(tag: Array<String>) = tag.has(1) && tag[0] == TAG_NAME && tag[1].isNotEmpty()
+
+        fun parse(tag: Array<String>): String? {
+            ensure(tag.has(1) && tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].isNotEmpty()) { return null }
+            return tag[1]
+        }
+
+        fun assemble(termination: GameTermination) = arrayOf(TAG_NAME, termination.name.lowercase())
+    }
+}

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip64Chess/end/tags/WinnerTag.kt

@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nip64Chess.end.tags
+
+import com.vitorpamplona.quartz.nip01Core.core.HexKey
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.utils.ensure
+
+class WinnerTag {
+    companion object {
+        const val TAG_NAME = "winner"
+
+        fun isTag(tag: Array<String>) = tag.has(1) && tag[0] == TAG_NAME && tag[1].isNotEmpty()
+
+        fun parse(tag: Array<String>): HexKey? {
+            ensure(tag.has(1) && tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].isNotEmpty()) { return null }
+            return tag[1]
+        }
+
+        fun assemble(winnerPubkey: HexKey) = arrayOf(TAG_NAME, winnerPubkey)
+    }
+}

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip64Chess/game/ChessGameEvent.kt

@@ -18,7 +18,7 @@
  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
-package com.vitorpamplona.quartz.nip64Chess
+package com.vitorpamplona.quartz.nip64Chess.game
 
 import androidx.compose.runtime.Immutable
 import com.vitorpamplona.quartz.nip01Core.core.Event
@@ -50,6 +50,16 @@ class ChessGameEvent(
     content: String, // PGN database format
     sig: HexKey,
 ) : Event(id, pubKey, createdAt, KIND, tags, content, sig) {
+    /**
+     * Get PGN content from event
+     */
+    fun pgn(): String = content
+
+    /**
+     * Get alt text for non-supporting clients (NIP-31)
+     */
+    fun altText(): String? = tags.firstOrNull { it.size >= 2 && it[0] == "alt" }?.get(1)
+
     companion object {
         const val KIND = 64
         const val ALT_DESCRIPTION = "Chess Game"
@@ -73,14 +83,4 @@ class ChessGameEvent(
             initializer()
         }
     }
-
-    /**
-     * Get PGN content from event
-     */
-    fun pgn(): String = content
-
-    /**
-     * Get alt text for non-supporting clients (NIP-31)
-     */
-    fun altText(): String? = tags.firstOrNull { it.size >= 2 && it[0] == "alt" }?.get(1)
 }

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip64Chess/jester/JesterContent.kt

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nip64Chess.jester
+
+import kotlinx.serialization.Serializable
+
+/**
+ * JSON content structure for Jester events
+ */
+@Serializable
+data class JesterContent(
+    val version: String = "0",
+    val kind: Int,
+    val fen: String = JesterProtocol.FEN_START,
+    val move: String? = null,
+    val history: List<String> = emptyList(),
+    val nonce: String? = null,
+    // Extended fields for Amethyst (backward compatible - jesterui ignores unknown fields)
+    val playerColor: String? = null, // "white" or "black" - challenger's color choice
+    val result: String? = null, // "1-0", "0-1", "1/2-1/2" for game end
+    val termination: String? = null, // "checkmate", "resignation", "draw_agreement", etc.
+)

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip64Chess/jester/JesterEvent.kt

@@ -18,7 +18,7 @@
  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
-package com.vitorpamplona.quartz.nip64Chess
+package com.vitorpamplona.quartz.nip64Chess.jester
 
 import androidx.compose.runtime.Immutable
 import com.vitorpamplona.quartz.nip01Core.core.Event
@@ -26,65 +26,12 @@ import com.vitorpamplona.quartz.nip01Core.core.HexKey
 import com.vitorpamplona.quartz.nip01Core.core.TagArrayBuilder
 import com.vitorpamplona.quartz.nip01Core.signers.EventTemplate
 import com.vitorpamplona.quartz.nip01Core.signers.eventTemplate
+import com.vitorpamplona.quartz.nip64Chess.Color
+import com.vitorpamplona.quartz.nip64Chess.GameResult
+import com.vitorpamplona.quartz.nip64Chess.GameTermination
 import com.vitorpamplona.quartz.utils.TimeUtils
-import kotlinx.serialization.Serializable
 import kotlinx.serialization.json.Json
 
-/**
- * Jester Protocol Implementation
- *
- * Compatible with jesterui (https://github.com/jesterui/jesterui)
- *
- * Key differences from previous implementation:
- * - Single event kind (30) for all chess messages
- * - Content is JSON with: version, kind, fen, move, history, nonce
- * - Event linking via e-tags: [startId] or [startId, headId]
- * - Full move history included in every move event
- *
- * Content kind values:
- * - 0: Game start (challenge)
- * - 1: Move
- * - 2: Chat (not implemented)
- *
- * Reference: https://github.com/jesterui/jesterui/blob/devel/FLOW.md
- */
-object JesterProtocol {
-    /** Jester uses kind 30 for all chess events */
-    const val KIND = 30
-
-    /** SHA256 of starting FEN position - used as reference for game discovery */
-    const val START_POSITION_HASH = "b1791d7fc9ae3d38966568c257ffb3a02cbf8394cdb4805bc70f64fc3c0b6879"
-
-    /** Standard starting FEN */
-    const val FEN_START = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"
-
-    /** Content kind for game start */
-    const val CONTENT_KIND_START = 0
-
-    /** Content kind for move */
-    const val CONTENT_KIND_MOVE = 1
-
-    /** Content kind for chat */
-    const val CONTENT_KIND_CHAT = 2
-}
-
-/**
- * JSON content structure for Jester events
- */
-@Serializable
-data class JesterContent(
-    val version: String = "0",
-    val kind: Int,
-    val fen: String = JesterProtocol.FEN_START,
-    val move: String? = null,
-    val history: List<String> = emptyList(),
-    val nonce: String? = null,
-    // Extended fields for Amethyst (backward compatible - jesterui ignores unknown fields)
-    val playerColor: String? = null, // "white" or "black" - challenger's color choice
-    val result: String? = null, // "1-0", "0-1", "1/2-1/2" for game end
-    val termination: String? = null, // "checkmate", "resignation", "draw_agreement", etc.
-)
-
 private val json =
     Json {
         ignoreUnknownKeys = true
@@ -352,30 +299,3 @@ fun Event.toJesterEvent(): JesterEvent? {
     if (kind != JesterProtocol.KIND) return null
     return JesterEvent(id, pubKey, createdAt, tags, content, sig)
 }
-
-/**
- * Game events container for Jester protocol
- */
-data class JesterGameEvents(
-    val startEvent: JesterEvent?,
-    val moves: List<JesterEvent>,
-) {
-    companion object {
-        fun empty() = JesterGameEvents(null, emptyList())
-    }
-
-    /** Get the latest move (with longest history) */
-    fun latestMove(): JesterEvent? = moves.maxByOrNull { it.history().size }
-
-    /** Get the current FEN position */
-    fun currentFen(): String = latestMove()?.fen() ?: startEvent?.fen() ?: JesterProtocol.FEN_START
-
-    /** Get the complete move history */
-    fun fullHistory(): List<String> = latestMove()?.history() ?: emptyList()
-
-    /** Check if game has ended */
-    fun isEnded(): Boolean = latestMove()?.result() != null
-
-    /** Get the game result if ended */
-    fun result(): String? = latestMove()?.result()
-}

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip64Chess/jester/JesterGameEvents.kt

@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nip64Chess.jester
+
+/**
+ * Game events container for Jester protocol
+ */
+data class JesterGameEvents(
+    val startEvent: JesterEvent?,
+    val moves: List<JesterEvent>,
+) {
+    companion object {
+        fun empty() = JesterGameEvents(null, emptyList())
+    }
+
+    /** Get the latest move (with longest history) */
+    fun latestMove(): JesterEvent? = moves.maxByOrNull { it.history().size }
+
+    /** Get the current FEN position */
+    fun currentFen(): String = latestMove()?.fen() ?: startEvent?.fen() ?: JesterProtocol.FEN_START
+
+    /** Get the complete move history */
+    fun fullHistory(): List<String> = latestMove()?.history() ?: emptyList()
+
+    /** Check if game has ended */
+    fun isEnded(): Boolean = latestMove()?.result() != null
+
+    /** Get the game result if ended */
+    fun result(): String? = latestMove()?.result()
+}

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip64Chess/jester/JesterProtocol.kt

@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nip64Chess.jester
+
+/**
+ * Jester Protocol Constants
+ *
+ * Compatible with jesterui (https://github.com/jesterui/jesterui)
+ *
+ * Key differences from previous implementation:
+ * - Single event kind (30) for all chess messages
+ * - Content is JSON with: version, kind, fen, move, history, nonce
+ * - Event linking via e-tags: [startId] or [startId, headId]
+ * - Full move history included in every move event
+ *
+ * Content kind values:
+ * - 0: Game start (challenge)
+ * - 1: Move
+ * - 2: Chat (not implemented)
+ *
+ * Reference: https://github.com/jesterui/jesterui/blob/devel/FLOW.md
+ */
+object JesterProtocol {
+    /** Jester uses kind 30 for all chess events */
+    const val KIND = 30
+
+    /** SHA256 of starting FEN position - used as reference for game discovery */
+    const val START_POSITION_HASH = "b1791d7fc9ae3d38966568c257ffb3a02cbf8394cdb4805bc70f64fc3c0b6879"
+
+    /** Standard starting FEN */
+    const val FEN_START = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"
+
+    /** Content kind for game start */
+    const val CONTENT_KIND_START = 0
+
+    /** Content kind for move */
+    const val CONTENT_KIND_MOVE = 1
+
+    /** Content kind for chat */
+    const val CONTENT_KIND_CHAT = 2
+}

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip64Chess/move/LiveChessMoveEvent.kt

@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nip64Chess.move
+
+import androidx.compose.runtime.Immutable
+import com.vitorpamplona.quartz.nip01Core.core.BaseAddressableEvent
+import com.vitorpamplona.quartz.nip01Core.core.HexKey
+import com.vitorpamplona.quartz.nip01Core.core.TagArrayBuilder
+import com.vitorpamplona.quartz.nip01Core.signers.eventTemplate
+import com.vitorpamplona.quartz.nip31Alts.alt
+import com.vitorpamplona.quartz.utils.TimeUtils
+
+/**
+ * Live Chess Move Event (Kind 30066)
+ *
+ * Individual move in a live chess game
+ *
+ * Tags:
+ * - d: game_id
+ * - move_number: move number (1-based)
+ * - san: move in Standard Algebraic Notation
+ * - fen: resulting position in FEN notation
+ * - p: opponent pubkey
+ *
+ * Content: Optional move comment
+ */
+@Immutable
+class LiveChessMoveEvent(
+    id: HexKey,
+    pubKey: HexKey,
+    createdAt: Long,
+    tags: Array<Array<String>>,
+    content: String,
+    sig: HexKey,
+) : BaseAddressableEvent(id, pubKey, createdAt, KIND, tags, content, sig) {
+    fun gameId() = tags.gameId()
+
+    fun moveNumber() = tags.moveNumber()
+
+    fun san() = tags.san()
+
+    fun fen() = tags.fen()
+
+    fun opponentPubkey(): String? = tags.firstOrNull { it.size >= 2 && it[0] == "p" }?.get(1)
+
+    fun comment(): String = content
+
+    companion object {
+        const val KIND = 30066
+        const val ALT_DESCRIPTION = "Chess move"
+
+        fun build(
+            gameId: String,
+            moveNumber: Int,
+            san: String,
+            fen: String,
+            opponentPubkey: String,
+            comment: String = "",
+            createdAt: Long = TimeUtils.now(),
+            initializer: TagArrayBuilder<LiveChessMoveEvent>.() -> Unit = {},
+        ) = eventTemplate(KIND, comment, createdAt) {
+            add(arrayOf("d", "$gameId-$moveNumber"))
+            gameId(gameId)
+            moveNumber(moveNumber)
+            san(san)
+            fen(fen)
+            add(arrayOf("p", opponentPubkey))
+            alt("$ALT_DESCRIPTION: $san")
+            initializer()
+        }
+    }
+}

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip64Chess/move/TagArrayBuilderExt.kt

@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nip64Chess.move
+
+import com.vitorpamplona.quartz.nip01Core.core.TagArrayBuilder
+import com.vitorpamplona.quartz.nip64Chess.move.tags.FenTag
+import com.vitorpamplona.quartz.nip64Chess.move.tags.GameIdTag
+import com.vitorpamplona.quartz.nip64Chess.move.tags.MoveNumberTag
+import com.vitorpamplona.quartz.nip64Chess.move.tags.SanTag
+
+fun TagArrayBuilder<LiveChessMoveEvent>.gameId(gameId: String) = addUnique(GameIdTag.assemble(gameId))
+
+fun TagArrayBuilder<LiveChessMoveEvent>.moveNumber(moveNumber: Int) = addUnique(MoveNumberTag.assemble(moveNumber))
+
+fun TagArrayBuilder<LiveChessMoveEvent>.san(san: String) = addUnique(SanTag.assemble(san))
+
+fun TagArrayBuilder<LiveChessMoveEvent>.fen(fen: String) = addUnique(FenTag.assemble(fen))

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip64Chess/move/TagArrayExt.kt

@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nip64Chess.move
+
+import com.vitorpamplona.quartz.nip01Core.core.TagArray
+import com.vitorpamplona.quartz.nip64Chess.move.tags.FenTag
+import com.vitorpamplona.quartz.nip64Chess.move.tags.GameIdTag
+import com.vitorpamplona.quartz.nip64Chess.move.tags.MoveNumberTag
+import com.vitorpamplona.quartz.nip64Chess.move.tags.SanTag
+
+fun TagArray.gameId() = firstNotNullOfOrNull(GameIdTag::parse)
+
+fun TagArray.moveNumber() = firstNotNullOfOrNull(MoveNumberTag::parse)
+
+fun TagArray.san() = firstNotNullOfOrNull(SanTag::parse)
+
+fun TagArray.fen() = firstNotNullOfOrNull(FenTag::parse)

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip64Chess/move/tags/FenTag.kt

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nip64Chess.move.tags
+
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.utils.ensure
+
+class FenTag {
+    companion object {
+        const val TAG_NAME = "fen"
+
+        fun isTag(tag: Array<String>) = tag.has(1) && tag[0] == TAG_NAME && tag[1].isNotEmpty()
+
+        fun parse(tag: Array<String>): String? {
+            ensure(tag.has(1) && tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].isNotEmpty()) { return null }
+            return tag[1]
+        }
+
+        fun assemble(fen: String) = arrayOf(TAG_NAME, fen)
+    }
+}

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip64Chess/move/tags/GameIdTag.kt

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nip64Chess.move.tags
+
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.utils.ensure
+
+class GameIdTag {
+    companion object {
+        const val TAG_NAME = "game_id"
+
+        fun isTag(tag: Array<String>) = tag.has(1) && tag[0] == TAG_NAME && tag[1].isNotEmpty()
+
+        fun parse(tag: Array<String>): String? {
+            ensure(tag.has(1) && tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].isNotEmpty()) { return null }
+            return tag[1]
+        }
+
+        fun assemble(gameId: String) = arrayOf(TAG_NAME, gameId)
+    }
+}

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip64Chess/move/tags/MoveNumberTag.kt

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nip64Chess.move.tags
+
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.utils.ensure
+
+class MoveNumberTag {
+    companion object {
+        const val TAG_NAME = "move_number"
+
+        fun isTag(tag: Array<String>) = tag.has(1) && tag[0] == TAG_NAME && tag[1].isNotEmpty()
+
+        fun parse(tag: Array<String>): Int? {
+            ensure(tag.has(1) && tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].isNotEmpty()) { return null }
+            return tag[1].toIntOrNull()
+        }
+
+        fun assemble(moveNumber: Int) = arrayOf(TAG_NAME, moveNumber.toString())
+    }
+}

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip64Chess/move/tags/SanTag.kt

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nip64Chess.move.tags
+
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.utils.ensure
+
+class SanTag {
+    companion object {
+        const val TAG_NAME = "san"
+
+        fun isTag(tag: Array<String>) = tag.has(1) && tag[0] == TAG_NAME && tag[1].isNotEmpty()
+
+        fun parse(tag: Array<String>): String? {
+            ensure(tag.has(1) && tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].isNotEmpty()) { return null }
+            return tag[1]
+        }
+
+        fun assemble(san: String) = arrayOf(TAG_NAME, san)
+    }
+}

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/utils/EventFactory.kt

@@ -114,13 +114,13 @@ import com.vitorpamplona.quartz.nip58Badges.BadgeProfilesEvent
 import com.vitorpamplona.quartz.nip59Giftwrap.seals.SealedRumorEvent
 import com.vitorpamplona.quartz.nip59Giftwrap.wraps.GiftWrapEvent
 import com.vitorpamplona.quartz.nip62RequestToVanish.RequestToVanishEvent
-import com.vitorpamplona.quartz.nip64Chess.ChessGameEvent
-import com.vitorpamplona.quartz.nip64Chess.JesterEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessDrawOfferEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessGameAcceptEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessGameChallengeEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessGameEndEvent
-import com.vitorpamplona.quartz.nip64Chess.LiveChessMoveEvent
+import com.vitorpamplona.quartz.nip64Chess.game.ChessGameEvent
+import com.vitorpamplona.quartz.nip64Chess.jester.JesterEvent
+import com.vitorpamplona.quartz.nip64Chess.draw.LiveChessDrawOfferEvent
+import com.vitorpamplona.quartz.nip64Chess.accept.LiveChessGameAcceptEvent
+import com.vitorpamplona.quartz.nip64Chess.challenge.LiveChessGameChallengeEvent
+import com.vitorpamplona.quartz.nip64Chess.end.LiveChessGameEndEvent
+import com.vitorpamplona.quartz.nip64Chess.move.LiveChessMoveEvent
 import com.vitorpamplona.quartz.nip65RelayList.AdvertisedRelayListEvent
 import com.vitorpamplona.quartz.nip66RelayMonitor.discovery.RelayDiscoveryEvent
 import com.vitorpamplona.quartz.nip66RelayMonitor.monitor.RelayMonitorEvent