Syzygy endgame tablebases
White to move
Black to move
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White is losing with DTZ 246
Kf5
Loss with DTZ 245
Kf3
Loss with DTZ 21
Kd3
Loss with DTZ 7
Be5
Loss with DTZ 3
Kd4
Loss with DTZ 3
Kd5
Loss with DTZ 3
Kf4
Loss with DTZ 3
This is a blessed loss.
Mate can be forced, but a draw can be achieved under the fifty-move rule.
KBBPvKQ.pgn
lichess.org
Histogram: KBBP losing vs. KQ (log scale)
Longest KBBPvKQ phases
KBBP winning with DTZ 65
KBBP winning with DTZ 109 (frustrated)
KBBP losing with DTZ 246 (frustrated)
KBBP losing with DTZ 100
KBBPvKQ statistics
5,373,776,982 (21.0%)
876,436 (0.0%)
3,727,151,424 (14.6%)
541,063,170 (2.1%)
15,957,643,312 (62.3%)
KBBPvKQ.json
(?)