Syzygy endgame tablebases

White is winning with DTZ 399

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


Histogram: KRRR winning vs. KQB (log scale)

Longest KRRRvKQB phases

KRRRvKQB statistics (unique positions)

White wins:
211,408,614,150 (55.0%)
Frustrated white wins:
2,524,755,819 (0.7%)
77,879,044,320 (20.3%)
Frustrated black wins:
168,885,327 (0.0%)
Black wins:
92,098,820,628 (24.0%)
KRRRvKQB.json (?)