Syzygy endgame tablebases
White to move
Black to move
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Black is losing with DTZ 160
Qc6+
Loss with DTZ 159
Qc8+
Loss with DTZ 157
Qe5
Loss with DTZ 5
Qa8
Loss with DTZ 3
Qe2
Loss with DTZ 3
Qe6
Loss with DTZ 3
Qe7
Loss with DTZ 3
Qg8
Loss with DTZ 3
Ka2
Loss with DTZ 1
Ba2
Loss with DTZ 1
Bc2
Loss with DTZ 1
Bd3
Loss with DTZ 1
Be4
Loss with DTZ 1
Bf5
Loss with DTZ 1
Qa4
Loss with DTZ 1
Qb5
Loss with DTZ 1
Qb8
Loss with DTZ 1
Qd7
Loss with DTZ 1
Qd8
Loss with DTZ 1
Qe1+
Loss with DTZ 1
Qe3+
Loss with DTZ 1
Qe4
Loss with DTZ 1
Qf7
Loss with DTZ 1
Qf8
Loss with DTZ 1
Qh8
Loss with DTZ 1
Bxg6
Zeroing
Qxg6
Zeroing
This is a blessed loss.
Mate can be forced, but a draw can be achieved under the fifty-move rule.
KQRBvKQB.pgn
lichess.org
Histogram: KQRB winning vs. KQB (log scale)
Longest KQRBvKQB phases
KQRB winning with DTZ 100
KQRB winning with DTZ 160 (frustrated)
KQRB losing with DTZ 90
KQRBvKQB statistics (unique positions)
White wins:
255,057,420,229 (68.1%)
Frustrated white wins:
476,792 (0.0%)
Draws:
66,012,401,214 (17.6%)
Black wins:
53,593,900,747 (14.3%)
KQRBvKQB.json
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