API Reference

Core Functions

Board Management

parseFEN(const char *fen) — Function

Parameters: fen – FEN string describing position

Returns: void

Parses a FEN string and sets up the board position, including piece placement, side to move, castling rights, en passant square, and initializes the hash key.

printBoard() — Function

Parameters: None

Returns: void

Prints the current board position to stdout with piece symbols, side to move, castling rights, en passant square, and hash key.

Move Generation

generateMoves(moves *moveList) — Function

Parameters: moveList – pointer to move list structure

Returns: void

Generates all pseudo-legal moves for the current position and stores them in the provided move list.

makeMove(int move, int moveFlag) — Function

Parameters: move – encoded move, moveFlag – allMoves or onlyCaptures

Returns: int – 1 if legal, 0 if illegal

Attempts to make a move on the board. Returns 1 if the move is legal (doesn’t leave own king in check), 0 otherwise.

Search

searchPosition(int depth) — Function

Parameters: depth – maximum search depth

Returns: void

Searches the current position using iterative deepening and prints the best move via UCI protocol.

negamax(int alpha, int beta, int depth) — Function

Parameters: alpha, beta – search window, depth – remaining depth

Returns: int – position score

Core search function implementing negamax with alpha-beta pruning.

Evaluation

evaluate() — Function

Parameters: None

Returns: int – position score in centipawns

Returns a static evaluation of the current position from the perspective of the side to move.

isAttacked(int square, int side) — Function

Parameters: square – target square, side – attacking side

Returns: int – 1 if attacked, 0 otherwise

Checks if a square is attacked by the specified side.