Syzygy endgame tablebases

Black is winning with DTZ 104

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

KQRRvKBP.pgn lichess.org

Histogram: KQRR losing vs. KBP (log scale)

Longest KQRRvKBP phases

KQRRvKBP statistics (unique positions)

White wins:
1,337,205,956,426 (99.5%)
Frustrated white wins:
77,614 (0.0%)
Draws:
4,686,034,234 (0.3%)
Frustrated black wins:
3,697,898 (0.0%)
Black wins:
1,612,002,096 (0.1%)
KQRRvKBP.json (?)