What is the strongest continuation for White?

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soitgoes317 (1851) vs. Caissarius (1798)

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

(white to move) 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 a6 5. Nc3 b5 6. g3 Bb7 7. Bg2 Nf6 8. O-O e6 9. Re1 Qc7 10. Nd5 Qd8 11. Bg5 Be7 12. Nxe7 Qxe7 13. Nf5 Qd7 14. Nxg7+ Kf8 15. Bxf6 h6 16. Qg4 Rh7 17. Nh5 Qc6 18. Bg7+ Ke7 19. Qh4+ Kd7 20. Nf6+

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