7...Bxh3 is wrong because it leads to 8.Qxg7 and a winning attack. Better seems to be O-O or Qd7.
Instead of 8.gxh3, best is 8.Qxg7 Rf8 9.Bg5 threatening 10.Bxf6
Instead of 10...d5?, perhaps 10...O-O and if 11.Bh6, then 11...Ne8.
Yup, 13.b4 wins the knight.
13...a6 and 14...b5 looks better than 13...Nxd5
Perhaps 14.Qg3 Rg8 15.Qxe5
Instead of 15.b4, time for 15.Rxg7! and if 15...Kxg7?? 16.Qg3+ Kf8 17.Bh6 mate. If 15...Bf6, then 16.Nxf6 Qxf6 17.Qxf6 Nxf6 18.Bh6 wins for White.
I am playing Black (or at least I am trying to). How many weak moves can you spot? ^_^
1. e4 e5 2. Bc4 Nc6 3. c3 Nf6 4. Qf3 Bc5 This is an automatic move and therefore incorrect. Even if this was the 'best' move it is very bad chess to make unthinking moves like I made here. Black should be looking for ways to punish White for bringing the Queen out early. Instead Black seems to be playing into White's plan. Was it a Jedi mind trick?
5. Nh3 d6 6. d3 Bg4 7. Qg3 Bxh3 A couple of Bishop moves that did nothing but encourage White to plan a battery down the semi-open g-file. Black has a lead in development, just move the Queen and castle and Black is ready for the middle game.
8. gxh3 Nh5 Wow! What an incredibly useless Knight move.
9. Qf3 Nf6 White capitalized on the mistake to reposition the Queen with a wonderful fork on the Knight and the mate. The Black Knight admits its mistake and slinks back to f6. (Like a beaten cur!)
10. Rg1 d5 Now its time for a psychology lesson. Having failed to improve its position after two moves Black feels that the mate threat on f7 is coming even though it has been blocked; Black feels Rook and Queen battery barreling down the g-file even though the Queen has left the file; and black FEELS the imminent loss of the pinned Knight even though the Knight hasn't been pinned yet. Black sees only doom and decides to add some more problems to take his mind off the ones he already sees.
After d5 it takes White some time to regain its composure after some prolonged chortling with glee. Hoorah! Free material and more threats! (If White did anything besides chortling and guffawing he will have to put it in his own blog.)
11. exd5 Na5 Another automatic move and in this case completely wrong. Black must be seeing another board since Na5 has nothing to do with this game. Is it supposed to be attacking the Bishop? I'll admit that it does threaten to take it for an entire half of a move but then White legislates the appropriate sanction. So far, all White has done has been to play some solid chess.
12. Bb5+ Kf8 ... and there was much rejoicing.
13. Nd2 ... What? No b4 to win the piece? Did White miss it? Is White also chasing ghosts and feels so paranoid about the underdeveloped pieces that it would rather develop than take a piece?
More likely White is still playing chess. White does not invest moves to take a Knight on the rim, a Knight that can do nothing and might as well be off the board already. White makes moves towards a centralized King that, in the words of Jeremy Silman and Josh Waitzkin, waves a red flag saying attack me. And the best way to attack is to get all of the pieces involved in the attack.
13 ... Nxd5 Black must agree since it leaves the fork intact to take a pawn.
14. Ne4 Be7 15. b4 a6 16. Ba4 Nc6 17. Bb3 Nf6 Black was seriously considering a sac on the b-pawn but aside from all the usual reasons for not making an unsound sacrifice there is also the fact that White doesn't have to take it anyway.
18. Ng5 OMG! That's the Queen's Knight? What was Black doing while it meandered over to the opposite quadrant of the board? So far Black has made a couple of pawn moves and moved four pieces including its King. White has moved twice as many pawns an has more pieces developed; more powerful pieces developed; and much greater development. Even White's Queen Bishop is developed and it hasn't even moved. Development, initiative, space, material, mobility, and just plain threat level all favor White. Black is busted and might have gotten a better position if it had simply pushed its b-pawn though g-pawn forward one square. Er... Black has a superior pawn skeleton.
Qd7 19. Nxf7 Rg8 20. Ng5 Rh8 21. Be3 Qxd3 22. Ne6+ Ke8 The position is resignable! But one of the basic guidelines for playing amateur chess is to never resign or draw while there is still some play. This is a rule taught by many GMs who charge $50 bucks an hour. You cannot learn anything from a resignation. Play the game and find out both how and why a position is resignable or drawable. The responsibility is on the winning side to prove the win. From this point on White has stopped making the best moves. For example: The Bh6 threat is never used.
23. Nxc7+ Kf8 24. Ne6+ Ke8 25. Nxg7+ Kf8 26. Ne6+ Ke8 27. Rc1 e4 28. Ng7+ Kf8 29. Ne6+ Ke8 30. Qd1 Ne5 31. Nc7+ Kd7
At this point White can trade off half the board and have an endgame with a two pawn advantage. One of those pawns is a doubled rook pawn but Black's isolated central-pawn will probably fall too.
And then White ran out of time... go figure.