AI pawn movement bug in casual

Opponent's pawn is on a5, my pawn is on b7. My turn.
I go b5 and he does axb6 with my pawn disappearing.

Lols and tears.

Very annoying bug for such an easy situation.

Not a bug. en.wikipedia.org/wiki/En_passant

Wow, I had no idea, thanks! Great stuff. I suppose there is no way to close this "report" :)