Syzygy endgame tablebases
White to move
Black to move
JavaScript required for interactive board view.
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
255,057,420,229 (68.1%)
476,792 (0.0%)
66,012,401,214 (17.6%)
53,593,900,747 (14.3%)
KQRBvKQB.json
(?)