Syzygy endgame tablebases

Black is losing with DTZ 12

KQBBvK.pgn lichess.org

Histogram: KQBB winning vs. K (log scale)

Longest KQBBvK phases

KQBBvK statistics (unique positions)

White wins:
147,633,898 (96.6%)
Draws:
5,152,562 (3.4%)
KQBBvK.json (?)