What is the strongest continuation for White?

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Analysis of john2001plus (1863) vs. bigpawn63 (1506)

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

(white to move) 1. Nf3 Nc6 2. d4 d5 3. c4 Nf6 4. cxd5 Nxd5 5. e4 Nf6 6. d5 Nb8 7. Nc3 e6 8. Bc4 exd5 9. Nxd5 Nxd5 10. Bxd5 Bb4+ 11. Bd2 Bxd2+ 12. Qxd2 O-O 13. O-O Bg4 14. Bxb7 Nd7 15. Bxa8 Qxa8 16. Qf4 Nf6 17. e5 Bxf3 18. exf6 Be4 19. Rfe1 Bg6 20. fxg7 Kxg7 21. Qxc7

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