99.4% accuracy, plus a brilliant move!!

99.4% accuracy, plus a brilliant move!!

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I had a nice near-miniature as black in a 3+0 on my anonymous account. 
White played a dubious line that is surprisingly popular at the 2200 level on chess.com. White sacrifices a pawn for, I don't know, open lines? It's not too hard to quickly learn how to respond after you've seen it once or twice.
Anyway, see the game below.
2210-rated opponent vs. Me (chess.com)

I figured 10...Bc5! had to be correct. It gives up the pawn on g7, but surely it must be poison to open the g-file for black. White brazenly took the pawn, and I made proper use of the newly created channel to white's king. 

Recently I saw this theme of drawing the king to g2, then following up with Qg4+ check. It can be a way to force a perpetual check, but in this case, it led to a forced mate. 

Questions/comments welcome.