Syzygy endgame tablebases

White is losing with DTZ 404

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

KRBNvKQB.pgn lichess.org

Histogram: KRBN losing vs. KQB (log scale)

Longest KRBNvKQB phases

KRBNvKQB statistics (unique positions)

White wins:
93,342,076,139 (21.4%)
Frustrated white wins:
4,059,145 (0.0%)
Draws:
88,297,484,536 (20.2%)
Frustrated black wins:
1,655,014,032 (0.4%)
Black wins:
253,879,555,048 (58.1%)
KRBNvKQB.json (?)