Syzygy endgame tablebases

Black is losing with DTZ 108

Nc3+ Loss with DTZ 107

Rb2+ Loss with DTZ 3 Nb2 Loss with DTZ 1 Ne3 Loss with DTZ 1 Nf2 Loss with DTZ 1 Kf8 Loss with DTZ 1 Ra2 Loss with DTZ 1 Rc2 Loss with DTZ 1 Rd2 Loss with DTZ 1 Re2 Loss with DTZ 1 Rf2 Loss with DTZ 1 Rg1 Loss with DTZ 1 Rg3 Loss with DTZ 1 Rg4 Loss with DTZ 1 Rh2 Loss with DTZ 1 Kxd7 Zeroing Rxg5 Zeroing

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

KRRRvKRN.pgn lichess.org

Histogram: KRRR winning vs. KRN (log scale)

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Longest KRRRvKRN phases

KRRRvKRN statistics (unique positions)

White wins:
389,078,673,105 (89.2%)

Frustrated white wins:
1,724,229 (0.0%)

Draws:
46,321,083,918 (10.6%)

Black wins:
674,346,516 (0.2%)

KRRRvKRN.json (?)