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Syzygy endgame tablebases

Black is losing with DTZ 160

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

KQRBvKQB.pgn lichess.org

Histogram: KQRB winning vs. KQB (log scale)

Longest KQRBvKQB phases

KQRBvKQB statistics

255,057,420,229 (68.1%)
476,792 (0.0%)
66,012,401,214 (17.6%)
53,593,900,747 (14.3%)
KQRBvKQB.json (?)