[reilly3000]

I found some correctness issues that leave me a little unimpressed, although it’s a pretty phenomenal piece of code golf in general. For example, on my second move I mistakenly entered f1a1 instead of f1a6. It accepted this and then suddenly I had a bishop where the rook should be and no idea if my rook still exists.

[wat10000]

It's intentionally rather limited. There's no validation of the input moves, and it leaves out some important rules.

> Moves are trusted and given in plain coordinates: no click-to-move, no castling, en passant, or promotion.

[mmmattt]

Kind of crazy to put “Complete” in the post’s title then.