Syzygy endgame tablebases

Black is losing with DTZ 148

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

KQBNvKRR.pgn lichess.org

Histogram: KQBN winning vs. KRR (log scale)

Longest KQBNvKRR phases

KQBNvKRR statistics (unique positions)

White wins:
302,876,467,092 (72.5%)
Frustrated white wins:
1,990,929,606 (0.5%)
Draws:
59,149,248,373 (14.2%)
Black wins:
53,583,105,313 (12.8%)
KQBNvKRR.json (?)