Syzygy endgame tablebases

Black is winning with DTZ 303

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

KRBPvKQB.pgn lichess.org

Histogram: KRBP losing vs. KQB (log scale)

Longest KRBPvKQB phases

KRBPvKQB statistics (unique positions)

White wins:
281,653,056,060 (20.8%)
Frustrated white wins:
10,762,747 (0.0%)
Draws:
150,793,822,374 (11.1%)
Frustrated black wins:
61,547,211 (0.0%)
Black wins:
922,535,109,742 (68.1%)
KRBPvKQB.json (?)