Syzygy endgame tablebases

White is losing with DTZ 133

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

KRBBvKQ.pgn lichess.org

Histogram: KRBB losing vs. KQ (log scale)

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Longest KRBBvKQ phases

KRBBvKQ statistics (unique positions)

White wins:
2,350,565,700 (30.3%)
Draws:
3,882,463,509 (50.0%)
Frustrated black wins:
125,049,432 (1.6%)
Black wins:
1,400,809,507 (18.1%)
KRBBvKQ.json (?)