Syzygy endgame tablebases

Black is losing with DTZ 164

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


Histogram: KQRR winning vs. KQB (log scale)

Longest KQRRvKQB phases

KQRRvKQB statistics (unique positions)

White wins:
280,241,476,261 (78.5%)
Frustrated white wins:
1,125,682 (0.0%)
43,410,145,395 (12.2%)
Frustrated black wins:
59,658,138 (0.0%)
Black wins:
33,204,871,590 (9.3%)
KQRRvKQB.json (?)