"The en passant move in chess has been around for quite some time. Sources state that the move was first invented in the year 1561 but didn’t get officially accepted in the FIDE rule book until the year 1880."
https://maroonchess.com/when-was-en-passant-introduced/
I first downloaded the gothamChess app in December and have been playing ever since. Also, I have heard about the rule En Pissant.
Is it true that Magnus was the first to use it during a gothamChess match against Kasparov when he was 13? Is this when it became a rule?