Syzygy endgame tablebases

Black is losing with DTZ 152

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


Histogram: KQRR winning vs. KQN (log scale)

Longest KQRRvKQN phases

KQRRvKQN statistics (unique positions)

White wins:
304,560,050,288 (82.5%)
Frustrated white wins:
472,022 (0.0%)
45,309,758,456 (12.3%)
Frustrated black wins:
3,239,754,956 (0.9%)
Black wins:
15,995,328,564 (4.3%)
KQRRvKQN.json (?)