Syzygy endgame tablebases

Black is losing with DTZ 128

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

KQRBNvKQ.pgn lichess.org

Histogram: KQRBN winning vs. KQ (log scale)

Longest KQRBNvKQ phases

KQRBNvKQ statistics (unique positions)

White wins:
352,377,987,983 (89.6%)
Frustrated white wins:
20,461,439 (0.0%)
Draws:
37,723,502,881 (9.6%)
Black wins:
2,968,124,907 (0.8%)
KQRBNvKQ.json (?)