That because your opponent has moved from h6-h5 and it is only applicable if the pawn had not moved at all (h7-h5).
en passant

Allygirl,
What can I say? I am an eejit! lol.
I was too busy trying to do a lot of different things that I overlooked the obvious.
Many thanks
I'm currently in a game where I think en passant is appropriate but I cannot execute the move. Am I wrong in thinking it is en passant or is there a specific chess.com move for en passant?
I have posted elsewhere but hope someone can help as I want to make a move now.
Unfortuantely, I don't know how to insert the game here!
Thanks