Syzygy endgame tablebases
White to move
Black to move
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Black is losing with DTZ 178
Rd6
Loss with DTZ 177
Rb6
Loss with DTZ 15
Ra6
Loss with DTZ 11
Rc7+
Loss with DTZ 3
Rc3
Loss with DTZ 1
Rc4
Loss with DTZ 1
Rc5
Loss with DTZ 1
Rc8
Loss with DTZ 1
Re6
Loss with DTZ 1
Rf6
Loss with DTZ 1
Rg6+
Loss with DTZ 1
Rh6
Loss with DTZ 1
Kc1
Loss with DTZ 1
Kc3
Loss with DTZ 1
Ke1
Loss with DTZ 1
Ke2
Loss with DTZ 1
Ke3
Loss with DTZ 1
Rxc2
Zeroing
Kxc2
Zeroing
This is a blessed loss.
Mate can be forced, but a draw can be achieved under the fifty-move rule.
KBBPPvKR.pgn
lichess.org
Histogram: KBBPP winning vs. KR (log scale)
Longest KBBPPvKR phases
KBBPP winning with DTZ 100
KBBPP winning with DTZ 178 (frustrated)
KBBPP losing with DTZ 31
KBBPPvKR statistics (unique positions)
White wins:
916,430,259,228 (76.3%)
Frustrated white wins:
231,133,604 (0.0%)
Draws:
280,980,817,720 (23.4%)
Black wins:
3,681,936,256 (0.3%)
KBBPPvKR.json
(?)