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by SamBam 1190 days ago
I trivially made it make an illegal move it my very first game, on the third move, just by deliberately playing weird moves:

> You are a chess grandmaster playing as black and your goal is to win in as few moves as possible. I will give you the move sequence, and you will return your next move. No explanation needed.

1. b4 d5 2. b5 a6 3. b6

> bxc6

No, it's ridiculous to say "oh, a blindfolded human might sometimes make a mistake." No, this is trivially easy to make it make a mistake. It has no internal chess model at all, it's just read enough chess games to be able to copy common patterns.