Move

1. d4 d5 2. c4 dxc4 3. e3 e6 4. Bxc4 c5 5. Nf3 a6 6. O-O Nf6 7. Nc3 b5 8. Bb3 Bb7 9. Qe2 Nbd7 10. e4 cxd4 11. Nxd4 Bc5 12. Be3 Qb6 13. Rfd1 Ne5
    Perhaps, here safer was to play 13...0-0 14 f3 Ne5 15 Rac1 Nc6 16 Qf2 Rfd8, as in the game Bjarnason-Thorhallsson, Akureyri 1997.
14. Rac1 Rc8??
    I played this horrible move very quickly. I still do not understand why Black may need it. After 14...0-0! Black would be OK. However, it took White's brilliant play to show what was wrong with Black's move.
15. Na4!! bxa4 16. Bxa4+ Ke7
   I did not like to play 16...Ned7, pinning my knight. As the analysis shows, White wins after 17 Rxc5! Qxc5 18 Nxe6, for example: 18... Qe5 19 Nxg7+ Kf8 20 Bh6.
17. Rxc5 Rxc5 18. Nb3
   Here I hard difficult time choosing between 18... Nxe4 and 18...Rhc8. As it happened, I made the wrong choice. Still, after 18... Nxe4 19 Nxc5 Nxc5 White has 20 Qd2! (suggested by Tony Miles) and Black is in deep trouble.
Rhc8?? 19. Nxc5 Rxc5 20. b4!+-
    This is what I missed...
Qxb4 21. Qd2! 1-0