Syzygy endgame tablebases

Black is losing with DTZ 140

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

KRRRBvKQ.pgn lichess.org

Histogram: KRRRB winning vs. KQ (log scale)

Longest KRRRBvKQ phases

KRRRBvKQ statistics (unique positions)

White wins:
376,555,520,850 (95.4%)
Frustrated white wins:
10,671,234 (0.0%)
Draws:
16,371,765,177 (4.1%)
Black wins:
1,606,475,949 (0.4%)
KRRRBvKQ.json (?)