#6481·Stockfish

Wrong evaluation for wrong color bishop.

Author: AliceRoseliaCreated Dec 17, 2025Updated Aug 29, 2026

Describe the issue

Stockfish gives a very wrong evaluation on wrong color bishop positions. (1 pawn or more). This does not occur with other drawn endgames I've tested such as two knights endgame. Whether or not this affects playing strength has yet to be tested.

Expected behavior

The evaluation should be drawn or close to draw.

Steps to reproduce

Try Stockfish on wrong color bishop position such as 4k3/8/p3b3/8/8/8/8/K7 w - - 0 2

Tablebase off.

Anything else?

No response

Operating system

All

Stockfish version

Stockfish dev-20251203-c109a88e

Source: official-stockfish/Stockfish