Why didn't I play 21.Bb6???

Chess is often about calculating properly - and not just playing what 'feels like' the right move to play.   In this game I should definitely have played my Bishop to b6 on move 21, however the temptation to get my d pawn to the 7th rank was just too great ... !  Of course I learned of the consequences of making such a move after my opponents simple response .. Nxd7.  

The game was a useful learning experience and needless to say I threw it away. I definitely seem to panic when I have the game on a plate! This is a habit I need to shed if I am seriously going to win more competitive chess games.

You can see that after all the exchanges I am too pawns down - I struggled on until Move 53, but the lost pawns meant I could not hold a draw ...  

As usual, any comments welcome ...

d4 Opening

1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 c6 5. Bg2 O-O 6. O-O d5 7. Nc3 dxc4 8. e4 Be6 9. a4 a5 10. h3 h6 11. Be3 Na6 12. Qd2 Kh7 13. Ne5 Qc8 14. Kh2 Ne8 15. f4 f5 16. d5 cxd5 17. exd5 Bg8 18. Rad1 Nb4 19. Nb5 Nf6 20. d6 Rd8 21. d7 Nxd7 22. Nxd7 Be6 23. Nb6?? Rxd2 24. Nxc8 Rxd1 25. Rxd1 Rxc8 0-1

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