Former FAQ entries 常见问答 - Games - Chess - After I moved my pawn two spaces forward, my opponent made a strange diagonal move with own pawn and my pawn disappeared. What happened?
3.2.1) After I moved my pawn two spaces forward, my opponent made a strange diagonal move with own pawn and my pawn disappeared. What happened?
This is called "en passant capture" and it is a legal move. Please visit the Chess rules page to find more information.