Syzygy endgame tablebases

Black is losing with DTZ 63

KBBBvKBB.pgn lichess.org

Histogram: KBBB winning vs. KBB (log scale)

Longest KBBBvKBB phases

KBBBvKBB statistics (unique positions)

White wins:
45,601,454,976 (9.2%)
Draws:
450,398,385,666 (90.7%)
Black wins:
399,564,468 (0.1%)
KBBBvKBB.json (?)