Syzygy endgame tablebases

Black is losing with DTZ 659

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


Histogram: KQBN winning vs. KQB (log scale)

Longest KQBNvKQB phases

KQBNvKQB statistics (unique positions)

White wins:
172,626,701,098 (43.1%)
Frustrated white wins:
4,652,548,550 (1.2%)
143,634,984,509 (35.8%)
Black wins:
79,741,993,527 (19.9%)
KQBNvKQB.json (?)