The ‘en passant’ move

The ‘en passant’ move- This move can only be used on the very next move after the pawn is advanced 2 spaces. For example - BLACK has a pawn at d4, suppose WHITE moves his e2-pawn to e4; if the WHITE had moved to e3 at the same time, the BLACK d4 pawn could be able to capture it, so now he can capture en-passant on his next move. But if BLACK decides to make another move instead, he gives up his right to capture. However, there is a special case for this - if an enemy pawn could have captured it, if it had only moved 1 square, the enemy is still able to capture.