Please describe the problem:
When you make a double step of a pawn, and there is an enemy pawn next to yours, the enemy can attack sideways destroying your pawn, but not ending up where it used to be.

Steps to reproduce:
Here is the *.pgn

[Event "Human versus GNU Chess"]
[Site "?"]
[Date "2009.01.15"]
[Round "?"]
[White "White"]
[Black "GNU Chess"]
[Result "*"]
[BlackAI "GNU Chess"]
[BlackLevel "easy"]

1. Nf3 Nf6 2. Nc3 d5 3. e4 dxe4 4. Ne5 Qd4 5. f4 exf3 *

 


Actual results:
The enemy hits a pawn without ending up on the position of the pawn.

Expected results:
The enemy does a legal move.

Does this happen every time?
It doesn't take every opertunity to cheat :P

Other information: