k

Nice interaction between the Knight and  Bishop. 

There is actually a second solution to the puzzle that produces a Mate in 3.  (If you tried these moves and the puzzle told you that you were wrong, take heart, you were right.  This is a very rare occurrance that a chess.com puzzle has an alternative answer)

Here is the actual game.  (Black actually won the game.  The roles were reversed for the puzzle in order to make it easier for discussion.  Also, the game ended after the 28th move, but the puzzle added the final moves to show us the final result.) 

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hmm

cool

buenísimo

Beautifyl!

Naaice.

decent puzzle

sweet

Attack attack attack

nice one...

very nice!

MAC>PC=TRUE  ;We love you Steve!

good..............................

very easy...

easy

According to the problem it is the white that wins, not the black. Plus the game is Keller vs Barda and not Barda vs Keller. Can you explain this?

Is there also a smothered mate here?

Qg5+  Kf8 (forced)

Re8+  R x e8

Qg8+  R x g8

Ktd7 (or Kth7) mate

Really good Queen sacrifice....nice puzzle :)