Syzygy endgame tablebases
White to move
Black to move
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Black is losing with DTZ 132
Qf4+
Loss with DTZ 131
Ba8
Loss with DTZ 1
Bb1
Loss with DTZ 1
Bb7
Loss with DTZ 1
Bc2
Loss with DTZ 1
Bc6
Loss with DTZ 1
Bd3
Loss with DTZ 1
Bd5
Loss with DTZ 1
Bf3
Loss with DTZ 1
Bf5
Loss with DTZ 1
Bg2
Loss with DTZ 1
Bg6
Loss with DTZ 1
Kg3+
Loss with DTZ 1
Qb8
Loss with DTZ 1
Qc7
Loss with DTZ 1
Qd6+
Loss with DTZ 1
Qe5
Loss with DTZ 1
Qg1
Loss with DTZ 1
Qg2
Loss with DTZ 1
Qg3
Loss with DTZ 1
Qh3
Loss with DTZ 1
Qh4
Loss with DTZ 1
Qh5
Loss with DTZ 1
Qh6+
Loss with DTZ 1
Bxh1
Zeroing
Bxh7
Zeroing
Qxh1
Zeroing
Qxh7
Zeroing
This is a blessed loss.
Mate can be forced, but a draw can be achieved under the fifty-move rule.
KQQRvKQB.pgn
lichess.org
Histogram: KQQR winning vs. KQB (log scale)
Longest KQQRvKQB phases
KQQR winning with DTZ 100
KQQR winning with DTZ 133 (frustrated)
KQQR losing with DTZ 45
KQQRvKQB statistics (unique positions)
White wins:
307,069,153,812 (92.3%)
Frustrated white wins:
855,214 (0.0%)
Draws:
20,813,897,138 (6.3%)
Black wins:
4,752,451,692 (1.4%)
KQQRvKQB.json
(?)