Syzygy endgame tablebases

Black is losing with DTZ 150

Qe3+ Loss with DTZ 149 Qe1+ Loss with DTZ 145 Qc8+ Loss with DTZ 117

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

KQRRvKQR.pgn lichess.org

Histogram: KQRR winning vs. KQR (log scale)

Longest KQRRvKQR phases

KQRRvKQR statistics (unique positions)

White wins:
229,418,640,157 (67.7%)

Frustrated white wins:
811,468 (0.0%)

Draws:
43,752,515,108 (12.9%)

Frustrated black wins:
395,902 (0.0%)

Black wins:
65,838,168,903 (19.4%)

KQRRvKQR.json (?)

KQRRvKQR dependencies

To probe all KQRRvKQR positions, these tables and their transitive dependencies are also required:

KQRvKRR · KQRRvKR · KQRvKQR · KQRRvKQ

KQRRvKQR.txt KQRRvKQR.dot