Syzygy endgame tablebases

White is losing with DTZ 216

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

KRBBvKQB.pgn lichess.org

Histogram: KRBB losing vs. KQB (log scale)

Longest KRBBvKQB phases

KRBBvKQB statistics (unique positions)

White wins:
96,872,746,222 (22.8%)
Draws:
87,590,154,493 (20.6%)
Frustrated black wins:
17,828,519,516 (4.2%)
Black wins:
222,764,764,957 (52.4%)
KRBBvKQB.json (?)

KRBBvKQB dependencies

To probe all KRBBvKQB positions, these tables and their transitive dependencies are also required:

KRBBvKB · KQBvKBB · KQBvKRB · KRBBvKQ

KRBBvKQB.txt KRBBvKQB.dot