Syzygy endgame tablebases

Black is losing with DTZ 11

KBBvKB.pgn lichess.org

Histogram: KBB winning vs. KB (log scale)

Longest KBBvKB phases

KBBvKB statistics (unique positions)

White wins:
13,227,254 (8.0%)
Draws:
152,618,703 (92.0%)
Black wins:
7,383 (0.0%)
KBBvKB.json (?)