Tactics is only a small part of the game in its entirety.
Position, key squares, latent threats, that's where the big game lies.
http://nb.lichess.org/PrWUZuys12. gxf3, looks like a positional bad move, but turns into a good one.
19. bb3. The rook on G1 and the bishop on B3 are both staring at G8, should pawns move, and back-rank problems occur, these 2 pieces will take care of it.
22. rxh3. The rook is on the H-file now, I wanted to move it back to be honest, but found rg1 to be a positional killer, the kingside is under fire!
24. rg1. This rook is a kiler, the pawn on the G file can quickly become a very weak piece, the opponent blundered with g6, and without a dark-squared bishop, he's weakening his dark squares arond the king big-time.
25. nf6+. Knight takes advantage of the weak square. I didn't see a checkmate when doing the move, nor did I see it later. I only noticed a checkmate once I had moved a little back and forth to buy enough time to look at the position properly.
Note: My game has flaws and weaknesses, as I'm sure others here will point out, (Yeah, I'm pointin fingers at you!) but I believe it has some positional elements worth looking at. (Just ignore my weak squares..and general bad positional play)