Syzygy endgame tablebases

Black is losing with DTZ 106

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

KQRRvKRB.pgn lichess.org

Histogram: KQRR winning vs. KRB (log scale)

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Longest KQRRvKRB phases

KQRRvKRB statistics (unique positions)

White wins:
370,049,055,861 (93.2%)
Frustrated white wins:
10,276 (0.0%)
Draws:
26,514,419,437 (6.7%)
Frustrated black wins:
7,892 (0.0%)
Black wins:
526,449,328 (0.1%)
KQRRvKRB.json (?)

KQRRvKRB dependencies

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

KRRvKRB · KQRvKRB · KQRRvKB · KQRRvKR

KQRRvKRB.txt KQRRvKRB.dot