Syzygy endgame tablebases

Black is losing with DTZ 139

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

KQRNvKQQ.pgn lichess.org

Histogram: KQRN winning vs. KQQ (log scale)

Longest KQRNvKQQ phases

KQRNvKQQ statistics (unique positions)

White wins:
116,634,119,544 (34.8%)
Frustrated white wins:
838,550 (0.0%)
Draws:
60,236,794,850 (18.0%)
Frustrated black wins:
73,188 (0.0%)
Black wins:
158,159,546,196 (47.2%)
KQRNvKQQ.json (?)