It is not usually much.. that I dominate in game from begining to end.

So, thsi game woudl had gone in Showcase forum, if not for questiosn that follow:

>> If I was my opponent, how could I have avoided these traps?

Actually, if you look a little further:

9... Nc6 is fine. If 10. Qxb7?  Nd4! and Nc7+ follows

10... Nc5, again I dont think you looked far enough

10.... Nc5?  11. fxe5 Nxb3 12. exf6 Nxa1  13. fxg7 Nc2+  14. Kd1 Kxg7 15. Nb3!   and black is lost

If you want to see how good a game was, analyse it with the aid of a computer. There is free software with a fide elo higher then 3000! Today Chessprograms are MUCH better then the best human player.  You may use a free GUI like Jose or Arena and a free engine like Toga II (Elo about 3000). Or you can use Fritz or Aquarium/Rybka and pay.

You can insert you Games in all of these GUI und check your game.

Here is a Error - analysis of Fritz 11, it only shows only the "Big Errors" higher then 0.30 (with 30 sec "thinking" for each Halfmove/PLY).

[Event "KID Tourny"]
[Site "?"]
[Date "????.??.??"]
[Round "1"]
[White "jogger147"]
[Black "phbookworm"]
[Result "0-1"]
[ECO "A07"]
[WhiteElo "1295"]
[BlackElo "1344"]
[Annotator "Fritz 11"]
[SetUp "1"]
[FEN "rnbqk2r/ppppppbp/5np1/8/2PPP3/2N5/PP3PPP/R1BQKBNR b KQkq - 0 1"]
[PlyCount "67"]

1... d6 2. d5
({-0.08 Fritz 11:} 2. Nf3 O-O 3. Be2 c5 4. d5 Qb6 5. O-O Bg4
6. Qb3 Nbd7 7. Be3 Ne5 8. Nxe5 Bxe2 9. Qxb6 axb6 10. Nxe2 dxe5 11. Nc3  {0.
34/18})

2... c6 3. Qa4
({-0.84 Fritz 11:} 3. Nf3 O-O 4. Bd3 Na6 5. O-O cxd5
6. cxd5 Nc5 7. Be3 Qa5 8. Rb1 Ng4 9. Bd4 Bxd4 10. Nxd4 Qb4 11. Nc2 Qa5 12. Nd4
{0.00/17})

3... O-O 4. h4
({-1.19 Fritz 11:} 4. Nf3 Na6 5. dxc6 Nc5 6.
Qc2 bxc6 7. Bd3 d5 8. cxd5 Bb7 9. O-O cxd5 10. exd5 Nxd3 11. Qxd3 Nxd5 12. Nd4
Nb4 13. Qb5 Qxd4 {-0.83/17})

4... Bd7 5. dxc6 Bxc6 6. Qc2 Qa5 7. Bd2 Qe5
({-0.32 Fritz 11:} 7... Na6 8. a3 Qb6 9. Be3 Nc5 10. f3 Nh5 11. Nge2 Qxb2
12. Qxb2 Nd3+ 13. Kd2 Nxb2 14. Nd4 Bxd4 15. Bxd4 Ng3 16. Kc2 Nxh1 17. Kxb2
{-1.16/17})

8. Nce2
({-2.41 Fritz 11:} 8. Bd3 Na6 9. Nf3 Qe6 10. Nd4 Nb4
11. Nxe6 Nxc2+ 12. Bxc2 fxe6 13. f3 Nh5 14. Kf2 Be5 15. Bg5 Ng3 16. Rhe1 Rf7
17. Rad1  {-0.32/18})

8... Bxe4 9. Qb3 Nbd7 10. f4

({-2.91 Fritz 11:}
10. Nf3 Bxf3 11. Bf4 Qf5 12. Qxf3 Ne5 13. Bxe5 Qxe5 14. O-O-O Ne4 15. Nc3 Nxc3
16. Qxc3 Qxc3+ 17. bxc3 Bxc3 18. Be2 Rac8 19. Kc2 Be5 {-2.17/17})

10... Nc5
({1.21 Fritz 11:} 10... Qc5 11. O-O-O Rfc8 12. Nc3 Nb6 13. Nxe4 Nxe4 14.
Be3 Qf5 15. Nf3 d5 16. Nd4 Qd7 17. Kb1 Nxc4 18. Bxc4 Rxc4 19. h5  {-2.91/16}
)

11. Qb5
({-12.71 Fritz 11:} 11. fxe5 Nxb3 12. axb3 dxe5 13. Nf3 Ng4
14. Nc3 Bc6 15. Ng5 Nf6 16. b4 a6 17. Nf3 Ng4 18. Bd3 Rfd8 19. Be4 f5 20. Bxc6
 {1.21/18})
 
11... Nd3+ 12. Kd1 Qxb5
({-8.42 Fritz 11:} 12... Nxb2+ 13. Qxb2 Qxb2 14. Bc3 Qc2+ 15. Ke1 Bd3 16. Rc1 Qxa2 17. Bxf6 Bxf6 18. Nf3 Qb2
19. Rd1 Bxc4 20. Ned4 Bd5 21. Rd2 Qc3 {-12.71/16})

13. cxb5 Nf2+ 14. Ke1 Nxh1 15. Rc1 Ng4 16. Rc4 f5 17. Nd4 Bxd4 18. Rxd4 Rfd8 19. a4 Rac8 20. Nh3 Rc2
21. Ng5 Ng3 22. Bc4+ d5 23. Bxd5+

({-17.89 Fritz 11:} 23. Nxe4 fxe4 24. Bxd5+ Rxd5 25. Rxd5 e3 26. Kd1 Rxd2+ 27. Rxd2 exd2 28. Kxd2 h5 29. Kd1 Nf5 30.
Ke2 Nxh4 31. g3 Nf5 32. Kf3 Kf7 33. Kg2 Nd4 34. b4  {-7.88/19})

23... Bxd5 24. Kd1
({-#19 Fritz 11:} 24. Nh3 Rxb2 25. Nf2 Rb1+ 26. Nd1 Rxd1+ 27. Kxd1
Bb3+ 28. Kc1 Rxd4 29. Bc3 Rxa4 30. Be1 Ne2+ 31. Kb2 Bc4 32. g3 Bxb5 33. Kc2 Ra3
34. Kb2 Re3 35. Bd2 Rxg3 {-17.74/19})

24... Rxb2 25. Rd3 Ne4
({-16.05 Fritz 11:} 25... Nf2+ 26. Kc1 Nxd3+ 27. Kd1 Bb3#
{-#3/7})

26. Be1 
({-#6Fritz 11:} 26. Kc1 Rxd2 27. Rxd2 Nxd2 28. Kxd2 h6 29. g3 hxg5 30. hxg5 Bb3+ 31.
Kc3 Bxa4 32. Kb4 Rd4+ 33. Kc3 Re4 34. b6 axb6 35. Kd3 Re3+ 36. Kc4 Rxg3 37. Kd4
{-16.05/19})
 
26... Rb1+ 27. Ke2 Bc4 28. Nxe4 Bxd3+ 29. Kf3 Rxe1 30. Ng5
Be2+ 31. Kg3 Rd3+ 32. Nf3 Rxf3+ 33. gxf3 Rg1+ 34. Kh3 Bf1# 0-1