Syzygy endgame tablebases
White to move
Black to move
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Black is losing with DTZ 110
Qc3+
Loss with DTZ 109
Qa4+
Loss with DTZ 107
Qc5
Loss with DTZ 5
Qc8
Loss with DTZ 5
Ke3
Loss with DTZ 5
Qb3
Loss with DTZ 3
Qc4
Loss with DTZ 3
Qe2
Loss with DTZ 3
Qf5
Loss with DTZ 3
Ke2
Loss with DTZ 3
Kg3
Loss with DTZ 3
Qa2+
Loss with DTZ 1
Qb1+
Loss with DTZ 1
Qb2+
Loss with DTZ 1
Qc1+
Loss with DTZ 1
Qc6
Loss with DTZ 1
Qc7
Loss with DTZ 1
Qd1+
Loss with DTZ 1
Qd2
Loss with DTZ 1
Qd3
Loss with DTZ 1
Qe4
Loss with DTZ 1
Qg6
Loss with DTZ 1
Qxh7
DTM 9
Zeroing
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)
⋮
Longest KQRRvKQ phases
KQRR winning with DTZ 82
KQRR winning with DTZ 111 (frustrated)
KQRR losing with DTZ 17
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
(?)