Checkmate In 20 Moves

Checkmate in 20 moves. It wasn't a good game, 3 mistakes, 4 blunders, I had tunnel vision on a checkmate. I wouldn't have done this in an actual rated game, which is why I played this way. So I am not really looking for criticism other than maybe the opening if you would like too.

You did something unforgivable, you didn't take en passant

lol

en passant declined ): 

Right, Viznik.

here is what black should of did

sorry for the mistakes

I thought he black was completely fine after Rf7 not f4 

that*