Syzygy endgame tablebases

White is losing with DTZ 231

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

KQBBvKQR.pgn lichess.org

Histogram: KQBB losing vs. KQR (log scale)

Longest KQBBvKQR phases

KQBBvKQR statistics (unique positions)

White wins:
141,559,723,832 (38.2%)
Frustrated white wins:
27,134,964 (0.0%)
Draws:
117,316,511,390 (31.7%)
Frustrated black wins:
1,003,166,772 (0.3%)
Black wins:
110,528,004,004 (29.8%)
KQBBvKQR.json (?)