Syzygy endgame tablebases

White is losing with DTZ 175

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

KRRRvKQR.pgn lichess.org

Histogram: KRRR losing vs. KQR (log scale)

Longest KRRRvKQR phases

KRRRvKQR statistics (unique positions)

White wins:
172,874,987,361 (47.2%)
Frustrated white wins:
362,070 (0.0%)
Draws:
57,104,401,164 (15.6%)
Frustrated black wins:
947,706 (0.0%)
Black wins:
136,192,676,415 (37.2%)
KRRRvKQR.json (?)