Opening and endgame databases

A database of opening positions and moves that a chess program can consult before normal search.

A precomputed database that gives exact results for endgames within a limited number of pieces.

A compact precomputed structure that stores minimal outcome information for many endgame positions.

The exact win, draw, or loss outcome that a tablebase assigns to an endgame position.

A metric counting the distance to forced mate when the winner hastens it and the defender delays it.

A precomputed endgame metric measuring the distance to a capture or promotion, or to mate if it comes first.

A precomputed endgame metric measuring the distance to mate or to the next move that resets the fifty-move counter.