What is the best continuation for White?

ICC tourney 1604 (12 3), Internet Chess Club
john2001plus (1753) vs. Zephyr (1551)

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

(white to move) 1. Nf3 d5 2. d4 Nf6 3. c4 e6 4. Nc3 Bb4 5. Bg5 h6 6. Bf4 Ne4 7. Rc1 O-O 8. e3 c5 9. Bd3 cxd4 10. exd4 Nxc3 11. bxc3 Ba3 12. Rb1 dxc4 13. Bxc4 a6 14. Bd3 b5 15. Be4 Ra7 16. Bxb8

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Pawn promotion:
	- Queen
	- Rook
	- Bishop
	- Knight