Syzygy endgame tablebases

Black is losing with DTZ 121

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

KRRRvKQQ.pgn lichess.org

Histogram: KRRR winning vs. KQQ (log scale)

⋮

Longest KRRRvKQQ phases

KRRRvKQQ statistics

85,645,647,498 (25.6%)
1,218,180 (0.0%)
81,878,027,868 (24.4%)
167,494,625,502 (50.0%)
KRRRvKQQ.json (?)