Syzygy endgame tablebases
White to move
Black to move
JavaScript required for interactive board view.
Black is losing with DTZ 150
Qe3+
Loss with DTZ 149
Qe1+
Loss with DTZ 145
Qc8+
Loss with DTZ 117
Qa4
Loss with DTZ 1
Qa8
Loss with DTZ 1
Qb5
Loss with DTZ 1
Qb8
Loss with DTZ 1
Qc6+
Loss with DTZ 1
Qd7
Loss with DTZ 1
Qd8
Loss with DTZ 1
Qe2
Loss with DTZ 1
Qe4
Loss with DTZ 1
Qe5
Loss with DTZ 1
Qe6
Loss with DTZ 1
Qe7
Loss with DTZ 1
Qf7
Loss with DTZ 1
Qf8
Loss with DTZ 1
Qg6
Loss with DTZ 1
Qg8
Loss with DTZ 1
Qh5
Loss with DTZ 1
Qh8
Loss with DTZ 1
Ke1
Loss with DTZ 1
Rxh1
Zeroing
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
KQRR winning with DTZ 100
KQRR winning with DTZ 150 (frustrated)
KQRR losing with DTZ 142 (frustrated)
KQRR losing with DTZ 100
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
(?)