No big deal, guys: I figured it out by accident resp. bad technique :olichess.org/GF8ycjXpEDgkI tried to reproduce it, it's 51 seemingly.lichess.org/cBMDgAHdlq0SProbably because I started from a given position?
Looks like a programming error to me indeed... it seems the computer doesn't claim because it only made 49 moves itself. And then, instead of moving, on the next move it claims because it's possible. Could be a wrong interpretation
I am confused for three reasons:1. I don't know why the AI didn't claim a draw on move 502. I don't know why you didn't claim a draw on move 513. I don't know why the AI claimed a draw on move 51