Syzygy endgame tablebases

Black is losing with DTZ 106

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

KQRRvKBB.pgn lichess.org

Histogram: KQRR winning vs. KBB (log scale)

Longest KQRRvKBB phases

KQRRvKBB statistics (unique positions)

White wins:
412,356,473,330 (99.4%)
Frustrated white wins:
3,059,824 (0.0%)
Draws:
2,639,676,948 (0.6%)
Black wins:
49,287,008 (0.0%)
KQRRvKBB.json (?)