Syzygy endgame tablebases

White is winning with DTZ 1

Qe1 Draw Bf2 Draw Bh2 Draw

Qa4+ Loss with DTZ 1 Qc4+ Loss with DTZ 1 Qd3+ Loss with DTZ 1 Qf5 Loss with DTZ 1 Qg6+ Loss with DTZ 1 Qh7 Loss with DTZ 1 Bd1 Loss with DTZ 1 Bg4 Loss with DTZ 1 Bh5 Loss with DTZ 1

KQBBvKQ.pgn lichess.org

Histogram: KQBB winning vs. KQ (log scale)

Longest KQBBvKQ phases

KQBBvKQ statistics (unique positions)

White wins:
4,820,374,547 (67.8%)

Frustrated white wins:
1,448,774 (0.0%)

Draws:
1,393,393,258 (19.6%)

Frustrated black wins:
76,776,090 (1.1%)

Black wins:
821,158,283 (11.5%)

KQBBvKQ.json (?)

KQBBvKQ dependencies

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

KBBvKQ · KQBBvK · KQBvKQ

KQBBvKQ.txt KQBBvKQ.dot