#7128·Stockfish

Very Sub Optimal Mating

Author: mstemberaCreated Sep 2, 2026Updated Sep 4, 2026

Describe the issue

Starting with move 88 in this CCC game https://www.chess.com/computer-chess-championship#event=504&game=1132 SF makes many useless king moves leading to a much longer mating sequence than necessary. Also it keeps displaying TB scores until move 101 not mate scores.

Expected behavior

Find shortest mate in such a simple position.

Steps to reproduce

Step through game https://www.chess.com/computer-chess-championship#event=504&game=1132

Anything else?

No response

Operating system

All

Stockfish version

dev-20260829-8bc5caa2

Source: official-stockfish/Stockfish