Types.h File Reference

Common type definitions and constants for the chess engine. More...

#include "chess.hpp"

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Namespaces
namespace	SearchConstants
	Global constants related to search and evaluation boundaries.
namespace	MoveOrderConstants
	Scores used to sort moves during the move picking phase.
namespace	MoveGen
	Utility wrappers for legal and capture move generation.

Typedefs
using	Board = chess::Board
	Alias for chess::Board.
using	Move = chess::Move
	Alias for chess::Move.
using	Movelist = chess::Movelist
	Alias for chess::Movelist.
using	Color = chess::Color
	Alias for chess::Color.
using	Square = chess::Square
	Alias for chess::Square.
using	Piece = chess::Piece
	Alias for chess::Piece.
using	PieceType = chess::PieceType
	Alias for chess::PieceType.
using	Bitboard = chess::Bitboard
	Alias for chess::Bitboard.
using	File = chess::File
	Alias for chess::File.
using	Rank = chess::Rank
	Alias for chess::Rank.

Functions
void	MoveGen::generateLegalMoves (Movelist &moves, const Board &board)
	Generates all pseudo-legal and legal moves for the given board state.
void	MoveGen::generateCaptures (Movelist &moves, const Board &board)
	Generates only legal capture and promotion moves for the given board state.

Variables
constexpr int	SearchConstants::INFINITE = 32000
	Absolute maximum score.
constexpr int	SearchConstants::MATE_SCORE = 31500
	Base score for checkmate.
constexpr int	SearchConstants::MATE_IN_MAX = MATE_SCORE - 300
	Threshold to detect mating sequences.
constexpr int	SearchConstants::TB_WIN_SCORE = 31000
	Base score for a tablebase win.
constexpr int	SearchConstants::TB_WIN_IN_MAX = TB_WIN_SCORE - 800
	Threshold to detect tablebase wins.
constexpr int	SearchConstants::DRAW_SCORE = 0
	Score for a draw position.
constexpr int	SearchConstants::CONTEMPT_FACTOR = 5
	Make draws slightly negative to encourage winning.
constexpr uint8_t	SearchConstants::TT_EXACT = 0
	Transposition table entry is an exact score.
constexpr uint8_t	SearchConstants::TT_ALPHA = 1
	Transposition table entry is an upper bound (failed low).
constexpr uint8_t	SearchConstants::TT_BETA = 2
	Transposition table entry is a lower bound (failed high).
constexpr int	SearchConstants::DEFAULT_DEPTH = 100
	Default maximum depth for search.
constexpr int	SearchConstants::MAX_PLY = 128
	Maximum supported plies from root.
constexpr int	SearchConstants::LMR_MIN_DEPTH = 3
	Minimum depth to consider Late Move Reductions (LMR).
constexpr int	SearchConstants::NULL_MOVE_MIN_DEPTH = 4
	Minimum depth to consider Null Move Pruning.
constexpr int	SearchConstants::MAX_EXTENSIONS = 8
	Maximum number of search extensions per path.
constexpr int16_t	SearchConstants::INVALID_EVAL = 32001
	Special value indicating an uncomputed or invalid static evaluation.
constexpr int16_t	MoveOrderConstants::HASH_MOVE_SCORE = 30000
	Highest priority for moves retrieved from the Transposition Table.
constexpr int16_t	MoveOrderConstants::CAPTURE_BASE = 10000
	Base score for captures, adjusted by MVV-LVA.
constexpr int16_t	MoveOrderConstants::KILLER_SCORE_1 = 9000
	Score for the primary killer move.
constexpr int16_t	MoveOrderConstants::KILLER_SCORE_2 = 8000
	Score for the secondary killer move.
constexpr int16_t	MoveOrderConstants::HISTORY_MAX = 8000
	Maximum possible history heuristic score.

Detailed Description

Common type definitions and constants for the chess engine.

This file wraps the underlying chess.hpp types into convenient aliases and defines globally used constants for search, move ordering, and evaluation.

Typedef Documentation

Bitboard

using Bitboard = chess::Bitboard

Alias for chess::Bitboard.

Board

using Board = chess::Board

Alias for chess::Board.

Color

using Color = chess::Color

Alias for chess::Color.

File

using File = chess::File

Alias for chess::File.

Move

using Move = chess::Move

Alias for chess::Move.

Movelist

using Movelist = chess::Movelist

Alias for chess::Movelist.

Piece

using Piece = chess::Piece

Alias for chess::Piece.

PieceType

using PieceType = chess::PieceType

Alias for chess::PieceType.

Rank

using Rank = chess::Rank

Alias for chess::Rank.

Square

using Square = chess::Square

Alias for chess::Square.