Re: 47 Year old's first tournament. Game 2 vs a 9 year old.
Quite an interesting game, but unfortunately both sides missed some good moves.
I'm not familiar with the QGA at all, so I won't comment that.
10... f6? looks weak to me. Not only does it allow 11. Bxe6 winning a pawn, but also if white doesn't see it, e6 will still be weak on the next moves.
11. Bxe6 looks ok. Both 11... Bxe6 12. Nxe6 Qb6 13. Bd2 and 11... fxg5 12. Bxg4 leave white a clear pawn up. 11. Bh4 isn't bad either though, e6 will drop soon anyway.
14... h5? is a bad move, losing a piece. White's bishop can always go to d6 or c7 (with a gain of tempo), but black's bishop has no squares on g4. ALso the sacrifice won't work, just because black has too few pieces aimed at white's king.
17. Bc7! looks more logical to me. Looking more closely, it actually seems to win right away, since 17... Qa6 runs into 18. Nd6+ with 19. Bxa6.
17... Rh7 does nothing... Black needs to double rooks on the h-file, and a better way to do that seems to be 17... Kf7, when 18. Bc7 Bxf2+! 19. Rxf2 Rh1+! 20. Kxh1 Qxf2 black threatens mate with Rh8+, g3 and Rxh2#
20. Nxa8 looks risky, and a safer alternative would be 20. Nxe6 with 21. Nxg5++ and 22. Nxh7, also winning a rook.
20... Qe5 looks better than 20... Qd6 since it immediately also threatens Qh8. Then after 21. g3 Qh8 22. f3 Rh1+ 23. Kf2 Qh2+ 24. Ke3 f4+ 25. gxf4 gxf4+ 26. Kd3 Ne5+ 27. Kd4 Nec6+ 28. Kc5 white seems to be getting away with it, but it certainly looks alot more threatening
22. exf5? is also playing with your life. Sure it threatens to win the e-pawn. But that's irrelevant! You're up dozens of points, and the only thing you need to worry about is not getting mated. If black played 22... Qh8 instead, then you'd get a line like above, and I don't think you saw that in the line above white just gets away with it.
24. Bxe6+ right away looks better, since now after 24. Rd7+ Nfe7 25. Bxe6+ Kxe6 your rook on d7 is hanging, and you don't want to lose that rook as well. After 24. Bxe6+ Kxe6 25. Qe4+ your attack does win.
29. Rxe7? loses the exchange; easier is 29. Bxg4 or 29. Nd5.
32. Rh1?? is a big blunder. Why did you give up a full rook for nothing there?
36... Kf7?? is a big one-move blunder as well. It's easy to see that Nxg5 then wins the exchange.