Syzygy endgame tablebases

Black is losing with DTZ 130

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


Histogram: KRRR winning vs. KQ (log scale)

Longest KRRRvKQ phases

KRRRvKQ statistics (unique positions)

White wins:
5,243,837,190 (74.7%)
Frustrated white wins:
34,200 (0.0%)
1,617,696,372 (23.0%)
Black wins:
159,890,868 (2.3%)
KRRRvKQ.json (?)