https://www.chessbench.org/
>GPT-6 Astra xHigh: 0.06% rejected moves
>GPT-6 Astra xHigh: 0.06% rejected moves
I could see myself messing up something at some point if the board is complicated enough and trying an illegal move, perhaps if a piece somewhere would attack my king if I moved another piece. Even through I do know the rules of chess, and I have played a few games once every so often.