Syzygy endgame tablebases

Black is losing with DTZ 110

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

KQRRvKQ.pgn lichess.org

Histogram: KQRR winning vs. KQ (log scale)

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Longest KQRRvKQ phases

KQRRvKQ statistics (unique positions)

White wins:
5,931,284,019 (90.5%)
Frustrated white wins:
9,022 (0.0%)
Draws:
556,533,096 (8.5%)
Black wins:
63,650,763 (1.0%)
KQRRvKQ.json (?)

KQRRvKQ dependencies

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

KRRvKQ · KQRRvK · KQRvKQ

KQRRvKQ.txt KQRRvKQ.dot