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Syzygy endgame tablebases

Black is losing with DTZ 108

This is a blessed loss. Mate can be forced, but a draw can be achieved under the fifty-move rule.

KRRRvKRB.pgn

Histogram: KRRR winning (log scale)

Longest KRRRvKRB phases

KRRRvKRB statistics

353,453,456,802 (83.3%)
32,328 (0.0%)
70,004,568,855 (16.5%)
14,754 (0.0%)
794,713,233 (0.2%)
KRRRvKRB.json (?)