Syzygy endgame tablebases

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

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 (?)