Syzygy endgame tablebases

Black is losing with DTZ 118

Rb1+ Loss with DTZ 117

Ra4+ Loss with DTZ 15 Rb2 Loss with DTZ 3 Rb3 Loss with DTZ 3 Re4 Loss with DTZ 3 Rb5 Loss with DTZ 1 Rb6 Loss with DTZ 1 Rb7 Loss with DTZ 1 Rb8 Loss with DTZ 1 Rc4 Loss with DTZ 1 Rd4 Loss with DTZ 1 Rf4 Loss with DTZ 1 Rg4 Loss with DTZ 1 Rh4 Loss with DTZ 1

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

KQBBBvKR.pgn lichess.org

Histogram: KQBBB winning vs. KR (log scale)

⋮

Longest KQBBBvKR phases

KQBBBvKR statistics (unique positions)

White wins:
420,546,864,192 (96.2%)

Frustrated white wins:
35,593,170 (0.0%)

Draws:
16,546,778,850 (3.8%)

Black wins:
194,952,708 (0.0%)

KQBBBvKR.json (?)