sideways pawn move?
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Do you mean en passant?
https://support.chess.com/en/articles/8557558-what-is-en-passant-it-s-not-an-illegal-pawn-move

Seriously guys, why would it be "en passant"? The way it's described, it's just the normal pawn capture.

This is a new player who is literally 100 rated. Everything is possible.