Syzygy endgame tablebases
White to move
Black to move
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Black is losing with DTZ 114
Ra1+
Loss with DTZ 113
Ra3
Loss with DTZ 3
Ra4
Loss with DTZ 3
Ra5
Loss with DTZ 3
Ra6
Loss with DTZ 3
Ra7
Loss with DTZ 3
Ra8
Loss with DTZ 3
Rb2+
Loss with DTZ 1
Rc2
Loss with DTZ 1
Rd2
Loss with DTZ 1
Re2
Loss with DTZ 1
Rf2
Loss with DTZ 1
Rxg2
Zeroing
This is a blessed loss.
Mate can be forced, but a draw can be achieved under the fifty-move rule.
KRRBNvKR.pgn
lichess.org
Histogram: KRRBN winning vs. KR (log scale)
⋮
Longest KRRBNvKR phases
KRRBN winning with DTZ 65
KRRBN winning with DTZ 115 (frustrated)
KRRBN losing with DTZ 3
KRRBNvKR statistics (unique positions)
White wins:
463,311,813,885 (99.4%)
Frustrated white wins:
118,864 (0.0%)
Draws:
2,356,871,185 (0.5%)
Black wins:
393,555,804 (0.1%)
KRRBNvKR.json
(?)