Syzygy endgame tablebases

Black is losing with DTZ 10

KRRRBBvK.pgn lichess.org

Histogram: KRRRBB winning vs. K (log scale)

Longest KRRRBBvK phases

KRRRBBvK statistics (unique positions)

White wins:
478,709,053,884 (98.4%)
Draws:
7,805,278,032 (1.6%)
KRRRBBvK.json (?)