Tell me why!!!

must be glitch...ask the moderator or file a complain

Your opponent resigned, according to your game archive.

lol it's just a way to attract attention:D

Conzipe i think you may be right, my mistake lol :)

lol forgot the en passant...but it seems perfect

i dont like mondaaaaays

lol u ppl confused me a lot anyway thx 

I suspect the opponent didn't know about en passant rule, and was confused because none of his moves are legal except that one.

Yes, en passant is the only legal move white has in this situation, which is why it is not checkmate.  But after bxa e.p., then Rxb7#. 

Then axb7

"why"

Oh right, I didn't visualize it right.  In that case, I'd just go for a Q & R checkmate on the A file.