What is the best continuation for White?

ICC 30 0, Internet Chess Club
Analysis of fiddler (1786) vs. mcplayerus (1968)

8 7 6 5 4 3 2 1 a b c d e f g h 0

(white to move) 1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. Nc3 c6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 c5 8. O-O a6 9. a4 Be7 10. dxc5 Bxc5 11. Qc2 O-O 12. Rd1 Qe7 13. Ne4 Nxe4 14. Qxe4 Nf6 15. Qe5 Bd7 16. Bd2 h6 17. Bc3 Bc6 18. Nd4 Bd6 19. Nxc6 bxc6 20. Rxd6

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Pawn promotion:
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