Syzygy endgame tablebases

Black is losing with DTZ 156

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


Histogram: KRRBB winning vs. KQ (log scale)

Longest KRRBBvKQ phases

KRRBBvKQ statistics (unique positions)

White wins:
331,730,124,110 (80.4%)
Frustrated white wins:
5,869,452 (0.0%)
76,745,995,384 (18.6%)
Frustrated black wins:
328,823,556 (0.1%)
Black wins:
4,014,022,174 (1.0%)
KRRBBvKQ.json (?)