Position

Array of Long integers used as Bitboards. The index in the array is equal to the ordinal value minus one of the corresponding piece (e.g., Black Knight distribution is at index Piece.BN.ordinal - 1).

True if Black can castle kingside (short castling). False otherwise.

True if Black can castle queenside (long castling). False otherwise.

True if the current side to move is in check. False otherwise.

True if the position is a checkmate (the current side is in check and has no legal moves). False otherwise.

A list of tuples, where each tuple represents a legal move from this position and the resulting new position (Tuple). This list effectively defines the legal branches of the game tree from the current position.

True if the position is a forced draw. This is true if the position results in a stalemate or lackOfMaterial. False otherwise.

The square index (0-63) where a pawn can be captured en passant. Returns -1 if no en passant capture is possible.

The square exposed to an en passant capture, if one exists. Returns null if no en passant capture is possible in the current position.

The FEN (Forsyth-Edwards Notation) string representation of the position.

True if the position has reached or exceeded 50 half-moves without a pawn move or capture.

True if the game state is concluded (terminal position), either due to a forced draw or checkmate. False otherwise.

The number of half-moves since the last pawn move or capture. This is used for the 50-move rule.

True if the position is a draw due to insufficient mating material (e.g., King vs. King). False otherwise.

The full move number in the game (starts at 1 and is incremented after Black's move).

The side (Side.WHITE or Side.BLACK) whose turn it is to move.

A 64-element array where the index corresponds to the square order defined in Square (A1=0, H8=63). The value of each element is the ordinal of the Piece occupying that square (0 for Piece.EMPTY, 1 for Piece.WP, and so on).

True if the position is a stalemate (the current side is not in check but has no legal moves). False otherwise.

True if White can castle kingside (short castling). False otherwise.

True if White can castle queenside (long castling). False otherwise.

True if it is White's turn to move. False if it is Black's turn.

The Zobrist hash key of the position. This is used for efficient position lookup and repetition detection.

Returns true if the evaluated Move is legal in the current position, and false otherwise.

Returns true if the move specified in the given notation is legal in the current position. If no notation is specified, Notation.UCI is assumed.

Retrieves the new Position that results from executing the provided legal Move. Throws a MoveException if the provided move is not legal in the current position.

Retrieves the new Position that results from executing the move specified in the given notation. Throws a MoveException if the move is not legal. If no notation is provided, Notation.UCI is assumed.