Syzygy endgame tablebases
White to move
Black to move
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Black is losing with DTZ 106
Ra1+
Loss with DTZ 105
Rb3+
Loss with DTZ 9
Ra2
Loss with DTZ 1
Ra4
Loss with DTZ 1
Ra5
Loss with DTZ 1
Ra6
Loss with DTZ 1
Rc3
Loss with DTZ 1
Rd3
Loss with DTZ 1
Re3
Loss with DTZ 1
Rf3
Loss with DTZ 1
Rg3
Loss with DTZ 1
Rh3
Loss with DTZ 1
This is a blessed loss.
Mate can be forced, but a draw can be achieved under the fifty-move rule.
KQRBBvKR.pgn
lichess.org
Histogram: KQRBB winning vs. KR (log scale)
⋮
Longest KQRBBvKR phases
KQRBB winning with DTZ 65
KQRBB winning with DTZ 107 (frustrated)
KQRBB losing with DTZ 3
KQRBBvKR statistics (unique positions)
White wins:
426,138,383,400 (99.7%)
Frustrated white wins:
80,126 (0.0%)
Draws:
1,101,104,630 (0.3%)
Black wins:
185,351,830 (0.0%)
KQRBBvKR.json
(?)