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who can explain to the class WHY en passant exists?

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However, it was felt to be unfair that this double move could be used to evade possible capture by an opposing pawn. That is why a pawn making the double first move can be captured by an opposing pawn as if it had moved only the one square

My guess is because of the pawn can move two space rule off it's starting position caused scenarios where the pawn can move past the other without engaging. They probably thought that wasn't ideal and created a new rule to combat that.