Syzygy endgame tablebases

Black is losing with DTZ 104

This is a blessed loss. Mate can be forced, but a draw can be achieved under the fifty-move rule.

KQBBvKBB.pgn lichess.org

Histogram: KQBB winning vs. KBB (log scale)

Longest KQBBvKBB phases

KQBBvKBB statistics (unique positions)

White wins:
374,228,361,070 (83.8%)
Frustrated white wins:
6,478,676 (0.0%)
Draws:
72,085,981,836 (16.1%)
Black wins:
151,684,952 (0.0%)
KQBBvKBB.json (?)