Syzygy endgame tablebases
White to move
Black to move
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Black is losing with DTZ 110
Rc1+
Loss with DTZ 109
Rb6+
Loss with DTZ 15
Ra6
Loss with DTZ 1
Rc2
Loss with DTZ 1
Rc3
Loss with DTZ 1
Rc4
Loss with DTZ 1
Rc5
Loss with DTZ 1
Rc7
Loss with DTZ 1
Rc8
Loss with DTZ 1
Rd6
Loss with DTZ 1
Re6
Loss with DTZ 1
Rf6
Loss with DTZ 1
Rg6
Loss with DTZ 1
Rh6
Loss with DTZ 1
Kg2
Loss with DTZ 1
This is a blessed loss.
Mate can be forced, but a draw can be achieved under the fifty-move rule.
KRRBvKR.pgn
lichess.org
Histogram: KRRB winning vs. KR (log scale)
⋮
Longest KRRBvKR phases
KRRB winning with DTZ 62
KRRB winning with DTZ 111 (frustrated)
KRRB losing with DTZ 3
KRRBvKR statistics (unique positions)
White wins:
6,999,234,042 (85.3%)
Frustrated white wins:
58,627 (0.0%)
Draws:
1,192,835,879 (14.5%)
Black wins:
8,641,700 (0.1%)
KRRBvKR.json
(?)