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Move didn't register correctly?

So just played a game and this happened:

Move 22

Moved my pawn to C4

He then took my pawn on C3



Really threw me out of whack.
So I can win forced with one of my 4 passed pawns say 1.a2-a4 against Black? En passant is just a bug?



PS: anyway, I would have taken the Bishop in the given game. :D
PPS: Sry! Now serious, google "en passant". That will help, @testydonkey
A long time ago pawns were now allowed to move two spaces on the first turn, and needed two moves to get from the second rank to the fourth.
Then the rule was introduced that allowed pawns to move two squares on their first move, but that created some changes people don't like; it allowed backwards pawns on their second rank to slip past the pawn blocking them without risk of being captured, and chess players did not like that.
Because of this, the en passant rule was introduced, which allows an pawn that would be able to capture the advancing pawn had at advanced only one spot to still be able to capture it if it makes a double move, but only on the turn immediately afterward.
In the official rules (www.fide.com/fide/handbook.html?id=171&view=article), the en passant rule is in section 3.7(d):

"A pawn occupying a square on the same rank as and on an adjacent file to an opponent’s pawn which has just advanced two squares in one move from its original square may capture this opponent’s pawn as though the latter had been moved only one square. This capture is only legal on the move following this advance and is called an ‘en passant’ capture."

You may also want to read the wikipedia page on en passant:
en.wikipedia.org/wiki/En_passant
And lichess has a lesson to practice it:
lichess.org/learn#/15
Bottom line: That was a legal move by the rules of chess.
Good luck in your future games, and I hope you will get a chance to use this move for your benefit.
Thanks for the explanation. I haven't seen it played before and I didn't know about it :D

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