What is the best defense for White?

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Analysis of john2001plus (1697) vs. MainStreetUSA (1650)

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

(white to move) 1. e4 c5 2. Nf3 d6 3. c3 Nf6 4. Be2 g6 5. O-O Bg7 6. Re1 O-O 7. Bf1 Bg4 8. h3 Bxf3 9. Qxf3 Nc6 10. d3 Nd7 11. Be3 f5 12. exf5 Rxf5 13. Qd1 Qb6 14. Nd2 d5 15. Qb3 Qxb3 16. Nxb3

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Pawn promotion:
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