That'd be really funny. Chess then became all about making a good move, but not too good, lest it may accidentially match with a chess engine and get you disqua

That'd be really funny. Chess then became all about making a good move, but not too good, lest it may accidentially match with a chess engine and get you disqualified. The meta would then to put the opponent in a spot with only one viable move option: They either get disqualified on the spot, or slowly suffer because they now lost an important piece. I was never really good at chess, but even when playing async games with friends over gameknot(?) I'd often used the "if opponent does X, do Y" feature because some moves were just obvious. Also, from what I gathered, you can instruct most chess engines to supply you with a list of moves for the current board state. So instead of picking the best move all the time, pick another good enough move to avoid your suggestion.