En passant


White Pawn a5 -a6
Black pawn b7-b5
Wouldn’t of been put in check or anything and because of that it cost me the game

White Pawn a5 -a6
Black pawn b7-b5
Wouldn’t of been put in check or anything and because of that it cost me the game
Your pawn needed to be on a5 to capture en passant after b5.
https://support.chess.com/en/articles/8557558-what-is-en-passant-it-s-not-an-illegal-pawn-move