function resolveEpoch(state, action) { var newState = JSON.parse(JSON.stringify(state)); function createBoard() { var board = []; for (var i = 0; i < 64; i++) { var coords = YamUtils.grid.toXY(i, 8); var row = coords.y; var col = coords.x; var isPlayable = (row + col) % 2 === 1; var piece = null; if (isPlayable) { if (row < 3) { piece = 'light'; } else if (row > 4) { piece = 'dark'; } } var bgColor = isPlayable ? '#8B4513' : '#DEB887'; var icon = getPieceIcon(piece); board.push({ piece: piece, playable: isPlayable, selected: false, validMove: false, bgColor: bgColor, icon: icon, pieceColor: getPieceColor(piece) }); } return board; } function getPieceIcon(piece) { if (!piece) return ''; if (piece === 'dark') return '⬤'; if (piece === 'light') return '◯'; if (piece === 'darkKing') return '♚'; if (piece === 'lightKing') return '♔'; return ''; } function getPieceColor(piece) { if (!piece) return 'transparent'; if (piece === 'dark' || piece === 'darkKing') return '#3D2914'; if (piece === 'light' || piece === 'lightKing') return '#F5DEB3'; return 'transparent'; } function getPlayerPieces(player) { if (player === 0) return ['dark', 'darkKing']; return ['light', 'lightKing']; } function isKing(piece) { return piece === 'darkKing' || piece === 'lightKing'; } function getForwardDirections(piece) { if (isKing(piece)) return [-1, 1]; if (piece === 'dark') return [-1]; if (piece === 'light') return [1]; return []; } function findValidMoves(board, fromIndex, piece) { var coords = YamUtils.grid.toXY(fromIndex, 8); var row = coords.y; var col = coords.x; var directions = getForwardDirections(piece); var moves = []; var jumps = []; for (var d = 0; d < directions.length; d++) { var rowDir = directions[d]; for (var colDir = -1; colDir <= 1; colDir += 2) { var newRow = row + rowDir; var newCol = col + colDir; if (!YamUtils.grid.isOOB(newCol, newRow, 8, 8)) { var newIndex = YamUtils.grid.toIndex(newCol, newRow, 8); var targetCell = board[newIndex]; if (!targetCell.piece) { moves.push({ index: newIndex, isJump: false }); } else { var jumpRow = row + rowDir * 2; var jumpCol = col + colDir * 2; if (!YamUtils.grid.isOOB(jumpCol, jumpRow, 8, 8)) { var jumpIndex = YamUtils.grid.toIndex(jumpCol, jumpRow, 8); var jumpCell = board[jumpIndex]; var playerPieces = getPlayerPieces(piece.includes('dark') ? 0 : 1); if (!jumpCell.piece && !playerPieces.includes(targetCell.piece)) { jumps.push({ index: jumpIndex, isJump: true, capturedIndex: newIndex }); } } } } } } if (jumps.length > 0) return jumps; return moves; } function hasAnyJumps(board, player) { var pieces = getPlayerPieces(player); for (var i = 0; i < 64; i++) { var cell = board[i]; if (cell.piece && pieces.includes(cell.piece)) { var moves = findValidMoves(board, i, cell.piece); for (var m = 0; m < moves.length; m++) { if (moves[m].isJump) return true; } } } return false; } function hasAnyMoves(board, player) { var pieces = getPlayerPieces(player); for (var i = 0; i < 64; i++) { var cell = board[i]; if (cell.piece && pieces.includes(cell.piece)) { var moves = findValidMoves(board, i, cell.piece); if (moves.length > 0) return true; } } return false; } function countPieces(board, player) { var pieces = getPlayerPieces(player); var count = 0; for (var i = 0; i < 64; i++) { if (pieces.includes(board[i].piece)) count++; } return count; } function clearHighlights(board) { for (var i = 0; i < 64; i++) { var coords = YamUtils.grid.toXY(i, 8); var isPlayable = (coords.y + coords.x) % 2 === 1; board[i].selected = false; board[i].validMove = false; board[i].bgColor = isPlayable ? '#8B4513' : '#DEB887'; } } function highlightValidMoves(board, fromIndex, moves) { board[fromIndex].selected = true; board[fromIndex].bgColor = '#DAA520'; for (var m = 0; m < moves.length; m++) { var move = moves[m]; board[move.index].validMove = true; board[move.index].bgColor = '#228B22'; } } function checkGameOver(board) { var darkCount = countPieces(board, 0); var lightCount = countPieces(board, 1); if (darkCount === 0) return { over: true, winner: 1 }; if (lightCount === 0) return { over: true, winner: 0 }; return { over: false, winner: -1 }; } switch (action.type) { case '$INIT': newState.board = createBoard(); newState.phase = 'WAITING'; newState.gameOver = false; newState.currentPlayer = 0; newState.selectedCell = null; newState.mustJump = false; newState.capturedDark = 0; newState.capturedLight = 0; newState.winner = -1; newState.timeoutCount = 0; newState.movesSinceCapture = 0; return newState; case 'JOIN': if (newState.phase === 'WAITING') { if (!newState.players) newState.players = []; var playerId = action.playerId; if (!newState.players.includes(playerId)) { newState.players.push(playerId); } if (newState.players.length >= 2) { newState.phase = 'SELECT_PIECE'; newState.currentPlayer = 0; newState.board = createBoard(); } } return newState; case 'SELECT': if (newState.phase !== 'SELECT_PIECE') return newState; if (newState.mustJump) return newState; var selectIndex = action.payload.index; if (selectIndex === undefined && action.payload.row !== undefined) { selectIndex = YamUtils.grid.toIndex(action.payload.col, action.payload.row, 8); } var cell = newState.board[selectIndex]; var playerPieces = getPlayerPieces(newState.currentPlayer); if (!cell.piece || !playerPieces.includes(cell.piece)) return newState; var validMoves = findValidMoves(newState.board, selectIndex, cell.piece); var hasJumpsAvailable = hasAnyJumps(newState.board, newState.currentPlayer); if (hasJumpsAvailable) { var hasJumpFromHere = validMoves.some(function(m) { return m.isJump; }); if (!hasJumpFromHere) return newState; } if (validMoves.length === 0) return newState; clearHighlights(newState.board); highlightValidMoves(newState.board, selectIndex, validMoves); newState.selectedCell = selectIndex; newState.phase = 'SELECT_DESTINATION'; newState.timeoutCount = 0; return newState; case 'MOVE': if (newState.phase !== 'SELECT_DESTINATION') return newState; if (newState.selectedCell === null && newState.selectedCell !== 0) return newState; var destIndex = action.payload.index; if (destIndex === undefined && action.payload.row !== undefined) { destIndex = YamUtils.grid.toIndex(action.payload.col, action.payload.row, 8); } var fromIndex = newState.selectedCell; var movingPiece = newState.board[fromIndex].piece; var moves = findValidMoves(newState.board, fromIndex, movingPiece); var selectedMove = null; for (var m = 0; m < moves.length; m++) { if (moves[m].index === destIndex) { selectedMove = moves[m]; break; } } if (!selectedMove) return newState; newState.board[destIndex].piece = movingPiece; newState.board[fromIndex].piece = null; if (selectedMove.isJump) { var capturedPiece = newState.board[selectedMove.capturedIndex].piece; newState.board[selectedMove.capturedIndex].piece = null; newState.board[selectedMove.capturedIndex].icon = ''; newState.board[selectedMove.capturedIndex].pieceColor = 'transparent'; if (capturedPiece === 'dark' || capturedPiece === 'darkKing') { newState.capturedDark++; } else { newState.capturedLight++; } newState.movesSinceCapture = 0; } else { newState.movesSinceCapture++; } var destCoords = YamUtils.grid.toXY(destIndex, 8); if (destCoords.y === 0 && movingPiece === 'dark') { newState.board[destIndex].piece = 'darkKing'; } else if (destCoords.y === 7 && movingPiece === 'light') { newState.board[destIndex].piece = 'lightKing'; } for (var i = 0; i < 64; i++) { newState.board[i].icon = getPieceIcon(newState.board[i].piece); newState.board[i].pieceColor = getPieceColor(newState.board[i].piece); } var gameResult = checkGameOver(newState.board); if (gameResult.over) { clearHighlights(newState.board); newState.phase = 'GAME_OVER'; newState.gameOver = true; newState.winner = gameResult.winner; newState.selectedCell = null; newState.mustJump = false; return newState; } if (selectedMove.isJump) { var furtherJumps = findValidMoves(newState.board, destIndex, newState.board[destIndex].piece); var canJumpAgain = furtherJumps.some(function(m) { return m.isJump; }); if (canJumpAgain) { clearHighlights(newState.board); highlightValidMoves(newState.board, destIndex, furtherJumps.filter(function(m) { return m.isJump; })); newState.selectedCell = destIndex; newState.mustJump = true; newState.phase = 'SELECT_DESTINATION'; return newState; } } clearHighlights(newState.board); newState.selectedCell = null; newState.mustJump = false; newState.currentPlayer = 1 - newState.currentPlayer; newState.timeoutCount = 0; if (!hasAnyMoves(newState.board, newState.currentPlayer)) { newState.phase = 'GAME_OVER'; newState.gameOver = true; newState.winner = 1 - newState.currentPlayer; return newState; } if (newState.movesSinceCapture >= 40) { var darkOnlyKings = true; var lightOnlyKings = true; for (var i = 0; i < 64; i++) { if (newState.board[i].piece === 'dark') darkOnlyKings = false; if (newState.board[i].piece === 'light') lightOnlyKings = false; } if (darkOnlyKings && lightOnlyKings) { newState.phase = 'GAME_OVER'; newState.gameOver = true; newState.winner = -2; return newState; } } newState.phase = 'SELECT_PIECE'; return newState; case 'CANCEL': if (newState.phase !== 'SELECT_DESTINATION') return newState; if (newState.mustJump) return newState; clearHighlights(newState.board); newState.selectedCell = null; newState.phase = 'SELECT_PIECE'; return newState; case 'TIMEOUT': newState.timeoutCount = (newState.timeoutCount || 0) + 1; if (newState.timeoutCount >= 3) { newState.phase = 'GAME_OVER'; newState.gameOver = true; newState.winner = 1 - newState.currentPlayer; return newState; } if (newState.phase === 'SELECT_PIECE') { var pieces = getPlayerPieces(newState.currentPlayer); var validPieces = []; var jumpsAvailable = hasAnyJumps(newState.board, newState.currentPlayer); for (var i = 0; i < 64; i++) { if (pieces.includes(newState.board[i].piece)) { var mvs = findValidMoves(newState.board, i, newState.board[i].piece); if (mvs.length > 0) { if (jumpsAvailable) { if (mvs.some(function(m) { return m.isJump; })) { validPieces.push(i); } } else { validPieces.push(i); } } } } if (validPieces.length > 0 && action.payload && action.payload.seed !== undefined) { var randomIndex = Math.floor(action.payload.seed * validPieces.length); var selectedIdx = validPieces[randomIndex]; var mvs = findValidMoves(newState.board, selectedIdx, newState.board[selectedIdx].piece); clearHighlights(newState.board); highlightValidMoves(newState.board, selectedIdx, mvs); newState.selectedCell = selectedIdx; newState.phase = 'SELECT_DESTINATION'; } } else if (newState.phase === 'SELECT_DESTINATION') { clearHighlights(newState.board); newState.selectedCell = null; newState.mustJump = false; newState.currentPlayer = 1 - newState.currentPlayer; newState.phase = 'SELECT_PIECE'; } return newState; case 'REMATCH': if (newState.phase !== 'GAME_OVER') return newState; newState.board = createBoard(); newState.phase = 'SELECT_PIECE'; newState.gameOver = false; newState.currentPlayer = 0; newState.selectedCell = null; newState.mustJump = false; newState.capturedDark = 0; newState.capturedLight = 0; newState.winner = -1; newState.timeoutCount = 0; newState.movesSinceCapture = 0; return newState; default: return newState; } }

Classic Chess

Join a Game

Host a Game