Syzygy endgame tablebases

Black is losing with DTZ 120

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


Histogram: KQRR winning vs. KQQ (log scale)

Longest KQRRvKQQ phases

KQRRvKQQ statistics (unique positions)

White wins:
160,930,167,668 (52.3%)
Frustrated white wins:
1,202,552 (0.0%)
31,527,921,430 (10.2%)
Black wins:
115,397,384,220 (37.5%)
KQRRvKQQ.json (?)