Syzygy endgame tablebases

Black is winning with DTZ 249

This is a cursed win. Mate can be forced, but a draw can be achieved under the fifty-move rule.

KQBBvKQQ.pgn lichess.org

Histogram: KQBB losing vs. KQQ (log scale)

Longest KQBBvKQQ phases

KQBBvKQQ statistics (unique positions)

White wins:
73,255,125,086 (21.6%)
Frustrated white wins:
47,379,422 (0.0%)
Draws:
66,887,261,032 (19.7%)
Frustrated black wins:
2,955,100,724 (0.9%)
Black wins:
196,135,819,030 (57.8%)
KQBBvKQQ.json (?)

KQBBvKQQ dependencies

To probe all KQBBvKQQ positions, these tables and their transitive dependencies are also required:

KQQvKBB · KQBBvKQ · KQQvKQB

KQBBvKQQ.txt KQBBvKQQ.dot