What is the best continuation for White?

ICC tourney 1312 (12 3), Internet Chess Club
Analysis of xiaoqixia (1598) vs. mdknight (944)

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

(white to move) 1. e4 c5 2. f4 d6 3. Nf3 Nc6 4. Bb5 Bd7 5. O-O a6 6. Bxc6 Bxc6 7. d3 e6 8. c4 g6 9. Nc3 Bg7 10. Qc2 Ne7 11. Be3 O-O 12. d4 cxd4 13. Nxd4 Bd7 14. Kh1 f5 15. Rad1 Rc8 16. e5 d5 17. cxd5 exd5 18. Qb3 Re8 19. Qxb7

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Pawn promotion:
	- Queen
	- Rook
	- Bishop
	- Knight