En Passant in Chess is a pawn move where if a pawn moves two squares and ends up in a square next to another pawn, he can be captured by the opponent’s pawn. The opposing pawn does this, not by moving into the square of the captured pawn, but one square behind it. Of all the moves in chess, this one is probably the most confusing. It is certainly hard to describe, so I am placing an image to help explain.
The reason the en passant rule was developed was because originally pawns could only move one square. When they were given the power to move two squares (in order to speed up the game) it was thought that this new power should be equalized.
