This class represents a player in the game, including its pieces and the current value of the player's position.

	adding/removing
	addBlackPieces addPiece:at: addWhitePieces movePiece:from:to: removePiece:at: replacePiece:with:at:

	copying
	copy copyPlayer: postCopy

	evaluation
	evaluate evaluateMaterial evaluatePosition positionalValue

	initialize
	initialize prepareNextMove

	moves-general
	findPossibleMoves findPossibleMovesAt: findQuiescenceMoves findValidMoves findValidMovesAt:

	moving
	applyCastleKingSideMove: applyCastleQueenSideMove: applyDoublePushMove: applyEnpassantMove: applyMove: applyNormalMove: applyPromotion: applyResign: applyStaleMate: updateCastlingStatus:

	testing
	canCastleKingSide canCastleQueenSide isValidMove: isValidMoveFrom:to: isWhitePlayer

	undo
	undoCastleKingSideMove: undoCastleQueenSideMove: undoDoublePushMove: undoEnpassantMove: undoMove: undoNormalMove: undoPromotion: undoResign: undoStaleMate:

	class initialization
	initialize initializeBishopMoves initializeCastlingConstants initializeCenterScores initializeConstants initializeKingMoves initializeKnightMoves initializeMoves initializePieceValues initializeRookMoves

	accessing	top
	board
	board:
	castlingRookSquare
	castlingStatus
	enpassantSquare
	materialValue
	numPawns
	opponent
	opponent:
	pieceAt: Return the piece at the given square
	pieces
	userAgent

	adding/removing	top
	addBlackPieces
	addPiece:at:
	addWhitePieces
	movePiece:from:to:
	removePiece:at:
	replacePiece:with:at:

	copying	top
	copy Answer another instance just like the receiver. Subclasses typically override this method; they typically do not override shallowCopy.
	copyPlayer: Copy all the volatile state from aPlayer
	postCopy

	evaluation	top
	evaluate
	evaluateMaterial Compute the board's material balance, from the point of view of the side player. This is an exact clone of the eval function in CHESS 4.5
	evaluatePosition Compute the board's positional balance, from the point of view of the side player.
	positionalValue Evaluate our current position

	initialize	top
	initialize ChessPlayer initialize
	prepareNextMove Clear enpassant square and reset any pending extra kings

	moves-general	top
	findPossibleMoves Find all possible moves. This method does not check if the move is legal, e.g., if the king of the player is under attack after the move. If the opponent is check mate (e.g., the king could be taken in the next move) the method returns nil. If the game is stale mate (e.g., the receiver has no move left) this method returns an empty array.
	findPossibleMovesAt: Find all possible moves at the given square. This method does not check if the move is legal, e.g., if the king of the player is under attack after the move. If the opponent is check mate (e.g., the king could be taken in the next move) the method returns nil. If the game is stale mate (e.g., the receiver has no move left) this method returns an empty array.
	findQuiescenceMoves Find all possible moves. This method does not check if the move is legal, e.g., if the king of the player is under attack after the move. If the opponent is check mate (e.g., the king could be taken in the next move) the method returns nil. If the game is stale mate (e.g., the receiver has no move left) this method returns an empty array.
	findValidMoves Find all the valid moves
	findValidMovesAt: Find all the valid moves

	moving	top
	applyCastleKingSideMove:
	applyCastleQueenSideMove:
	applyDoublePushMove:
	applyEnpassantMove:
	applyMove: Apply the given move
	applyNormalMove:
	applyPromotion:
	applyResign: Give up.
	applyStaleMate: Itsa draw.
	updateCastlingStatus: Cannot castle when king has moved

	testing	top
	canCastleKingSide
	canCastleQueenSide
	isValidMove: Is the given move actually valid for the receiver? If the receiver's king can't be taken after applying the move, it is.
	isValidMoveFrom:to:
	isWhitePlayer

	undo	top
	undoCastleKingSideMove:
	undoCastleQueenSideMove:
	undoDoublePushMove:
	undoEnpassantMove:
	undoMove: Undo the given move
	undoNormalMove:
	undoPromotion:
	undoResign:
	undoStaleMate:

	accessing	top
	king
	rook

	class initialization	top
	initialize ChessPlayer initialize
	initializeBishopMoves ChessPlayer initialize
	initializeCastlingConstants ChessPlayer initialize
	initializeCenterScores ChessPlayer initialize
	initializeConstants ChessPlayer initialize
	initializeKingMoves ChessPlayer initialize
	initializeKnightMoves ChessPlayer initialize
	initializeMoves ChessPlayer initialize
	initializePieceValues
	initializeRookMoves ChessPlayer initialize