Syzygy endgame tablebases

Black is losing with DTZ 102

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

KRBBBvKN.pgn lichess.org

Histogram: KRBBB winning vs. KN (log scale)

Longest KRBBBvKN phases

KRBBBvKN statistics (unique positions)

White wins:
498,031,470,867 (97.8%)
Frustrated white wins:
43,480,488 (0.0%)
Draws:
11,001,090,333 (2.2%)
Black wins:
2,571,462 (0.0%)
KRBBBvKN.json (?)