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[PraseodymiumSpike]

Essentially, this would make it so that wéiqí could be played using Fairy-Stockfish. Capture by Surrounding would mean that when a string is surrounded in the wéiqí style, it is captured. When a player plays, potential capture of the opponent's pieces would be calculated, and then potential capture of one's own pieces would be calculated. Royal pieces in atari would be considered to be in check, and by default, it would be illegal to capture your own royal piece. Also, it could be made illegal for some Piece types to be dropped in a way that one's own Pieces would be captured at all. This would allow us to simulate the 9-by-9 version of wéiqí. The engine doesn't actually have to be very good at playing; it would just be helpful if it could determine which moves were legal.

[PraseodymiumSpike]

Actually, you could make any play that captures any of your own pieces illegal. This would make it so pieces can't capture royal pieces if that would result in the capturing piece's instant capture, though.

[osmiumic]

i'd like to note that not all variants of Go make self-capture illegal. very occasionally, there is a tactical situation where self-capture is better from what i remember reading about it. (i also play Go as a hobby)