What is the strongest continuation for White?

ICC tourney 1763 (12 3), Internet Chess Club
john2001plus (1683) vs. trivialpursuit (1589)

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

(white to move) 1. Nf3 c5 2. e4 Nc6 3. c3 e5 4. Bc4 Be7 5. O-O Nf6 6. Re1 O-O 7. d4 cxd4 8. cxd4 d6 9. Nc3 Bg4 10. dxe5 Nxe5 11. Be2 Bxf3 12. Bxf3 Qb6 13. Rb1 Rfc8 14. Be3 Qa5 15. Be2 Nc4 16. Bd4 Ne5 17. f4 Nc6 18. Bxf6 Bxf6 19. Nd5 Bd8 20. b4 Qxa2 21. Nc3 Qe6 22. Bg4

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