What is the best continuation for White?

ICC tourney 1333 (12 3), Internet Chess Club
Analysis of yoshi (1685) vs. TexasMade (1422)

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

(white to move) 1. Nf3 Nf6 2. d4 d5 3. c4 e6 4. Nc3 c5 5. cxd5 exd5 6. Bg5 Be6 7. e4 Be7 8. Bb5+ Nc6 9. exd5 Nxd5 10. Bxe7 Qxe7 11. O-O O-O 12. Re1 Rad8 13. Bxc6 Nxc3 14. bxc3 bxc6 15. Qa4 cxd4 16. Nxd4 Qd6 17. Nxe6 fxe6 18. Qxa7 Qd2 19. a4 Qxc3 20. a5 Ra8 21. Qe3

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Pawn promotion:
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