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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.

KRRRvKQ.pgn lichess.org

Histogram: KRRR winning vs. KQ (log scale)

Longest KRRRvKQ phases

KRRRvKQ statistics

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