Syzygy endgame tablebases

Black is losing with DTZ 104

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

KQQRvKBB.pgn lichess.org

Histogram: KQQR winning vs. KBB (log scale)

Longest KQQRvKBB phases

KQQRvKBB statistics (unique positions)

White wins:
390,097,822,730 (99.8%)
Frustrated white wins:
3,697,892 (0.0%)
Draws:
633,912,194 (0.2%)
Black wins:
32,145,084 (0.0%)
KQQRvKBB.json (?)