Tablebase Namespace Reference

Enumerations
enum class	WDL {   WIN = 2 , CURSED_WIN = 1 , DRAW = 0 , BLESSED_LOSS = -1 ,   LOSS = -2 }
	Tablebase probe result for Win-Draw-Loss. More...

Functions
bool	init (const std::string &path)
	Initializes tablebases with the given path.
bool	available (const Board &board)
	Checks if a position is within the tablebase piece limits.
std::optional< WDL >	probeWDL (const Board &board)
	Probes the Win-Draw-Loss (WDL) table.
std::optional< std::tuple< Move, WDL, int > >	probeRoot (const Board &board)
	Probes the Distance-to-Zero (DTZ) table for root moves.
int	wdlToScore (WDL wdl, int mate_ply)
	Converts a WDL result to a centipawn score for search evaluation.
int	maxPieces ()
	Gets the maximum number of pieces supported by the loaded tablebases.
bool	isInitialized ()
	Checks if tablebases have been successfully initialized.

Variables
static bool	initialized_ = false
static int	maxPieces_ = 0

Enumeration Type Documentation

WDL

enum class Tablebase::WDL

strong

Tablebase probe result for Win-Draw-Loss.

Enumerator
WIN	Forced win.
CURSED_WIN	Win, but thwarted by the 50-move rule (draw).
DRAW	Forced draw.
BLESSED_LOSS	Loss, but saved by the 50-move rule (draw).
LOSS	Forced loss.

Function Documentation

available()

bool Tablebase::available

(

const Board &

board

)

Checks if a position is within the tablebase piece limits.

Parameters

board

The chess board to check.

Returns

True if the board has <= maxPieces() pieces.

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init()

bool Tablebase::init

(

const std::string &

path

)

Initializes tablebases with the given path.

Parameters

path	Path to the Syzygy tablebase files.

Returns

True on success, false otherwise.

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isInitialized()

bool Tablebase::isInitialized

(

)

Checks if tablebases have been successfully initialized.

maxPieces()

int Tablebase::maxPieces

(

)

Gets the maximum number of pieces supported by the loaded tablebases.

probeRoot()

std::optional< std::tuple< Move, WDL, int > > Tablebase::probeRoot

(

const Board &

board

)

Probes the Distance-to-Zero (DTZ) table for root moves.

Parameters

board

The chess board to probe.

Returns

Tuple of best move, WDL value, and DTZ value, or std::nullopt on failure.

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probeWDL()

std::optional< WDL > Tablebase::probeWDL

(

const Board &

board

)

Probes the Win-Draw-Loss (WDL) table.

Parameters

board

The chess board to probe.

Returns

WDL value from side-to-move's perspective, or std::nullopt on failure.

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wdlToScore()

int Tablebase::wdlToScore	(	WDL	wdl,
		int	mate_ply )

Converts a WDL result to a centipawn score for search evaluation.

Parameters

wdl	The WDL result.
mate_ply	Distance to mate (used to scale WIN/LOSS scores).

Returns

Centipawn score representation of the tablebase result.

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Variable Documentation

initialized_

bool Tablebase::initialized_ = false

static

maxPieces_

int Tablebase::maxPieces_ = 0

static