Syzygy endgame tablebases

Black is losing with DTZ 140

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


Histogram: KQRR winning vs. KQP (log scale)

Longest KQRRvKQP phases

KQRRvKQP statistics (unique positions)

White wins:
1,014,880,134,604 (88.3%)
Frustrated white wins:
3,468,306 (0.0%)
102,779,757,830 (8.9%)
Frustrated black wins:
5,689,478 (0.0%)
Black wins:
31,298,074,258 (2.7%)
KQRRvKQP.json (?)