How to fix 1 turn tactical errors I am a very good attacking and tactical player. There is just one problem. While I catch combinations that might even require 5 or 6 moves, I cannot find 1 turn ones. Let's see this game I played today:

 [FEN ""]

 1. e4 e5 2. Nf3 d6 3. d4 exd4 4. Nxd4 Nf6 5. Nc3 Nbd7 6. Bc4 Ne5 7. Bb3 Be7 8.
Bf4 O-O 9. Qd2 Ng6 10. Bg5 Re8 11. O-O-O c6 12. h4 d5 13. exd5 Nxd5 14. Bxe7
Ndxe7 15. h5 Ne5 16. h6 g6 17. Qf4 Nd5 18. Nxd5 cxd5 19. Nf3 Nxf3 20. Qxf3 Qg5+
21. Kb1 Bg4 22. Qc3 Qe5 23. Qxe5 Rxe5 24. Rxd5 Re2 25. Rhd1 Ree8 26. R1d4 Re1+
27. Rd1 Rxd1+ 28. Rxd1 Bxd1 29. f3 Be2 30. c4 b5 31. cxb5 Bxb5 32. Bd5 Rc8 33.
Be4 f5 34. Bc2 Kf7 35. a4 Rxc2 36. Kxc2 Bxa4+ 37. b3 Bb5 38. g4 f4 39. Kc3 Kf6
40. Kd4 Kg5 41. Ke4 Bc6+ *


I was white. This is the one I am presenting, but there are many games where I missed 1 turn tactics. Please help me.
It is a common problem to calculate all the variations and then suddenly realize that the first move was simply terrible. Actually, there is a rule that should be applied after finishing a complicated calculation, the Blumenfeld rule!

The Blumenfeld rule is formulated roughly as follows. After finishing a complicated calculation, take a fresh look at the position on the board. Try to picture the position directly after the next move you plan to make. Check whether you are missing something trivial. Are you perhaps losing a piece after this move? Are you missing a simple check that makes you lose material? Perhaps you will even be checkmated in a few moves? Only after completing this check for terrible blunders can you now go on and make your move.

This rule does not come easy to any player at any level!