Syzygy endgame tablebases

Black is losing with DTZ 581

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

KRRNvKRR.pgn lichess.org

Histogram: KRRN winning vs. KRR (log scale)

Longest KRRNvKRR phases

KRRNvKRR statistics (unique positions)

White wins:
160,933,852,332 (37.2%)
Frustrated white wins:
38,263,694,798 (8.8%)
Draws:
207,018,085,544 (47.8%)
Frustrated black wins:
1,126,184 (0.0%)
Black wins:
26,488,119,710 (6.1%)
KRRNvKRR.json (?)