I've just mated a friend by accident! His king was advanced in the end game. I moved a pawn 2 squares to check him, believing his adjacent pawn could take mine by en passant. Instead the computer gave me the game.

Is this part of the en passant rule I never knew, or is it a bug in the site? 

I've never heard of any rule that en passant wouldn't be valid just because the first pawn put the king in check. Looks like a bug to me but I could be wrong.

I'd put the game up here, but I'm too out of touch with reality to know how.

Looks like a bug:

Thanks. One day I'll become computer literate. Maybe.

Sorry I was a bit slow.

So many nice people out there...

 

Hey, I got a smilie. Maybe there's hope for me yet? 

Yes, this is definately a bug in Chess.com, we will work to fix this as soon as possible. Thank you for reporting this.

No problem. Just wanted to ensure there wasn't a rule I'd never heard of!

You should submit that rule to the official chess commitee, any check made by a pawn that could be taken en passant is an automatic win.

At least you would have won anyway...

Wow good game play!