What is the strongest continuation for White?

ICC tourney 1306 (12 3), Internet Chess Club
Analysis of yoshi (1679) vs. IAlwaysWin (1550)

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

(white to move) 1. Nf3 d5 2. d4 Nf6 3. c4 c6 4. e3 a6 5. Nc3 Bf5 6. Qb3 b5 7. cxd5 cxd5 8. Ne5 g6 9. a4 bxa4 10. Qxa4+ Nbd7 11. Bb5 Bg7 12. O-O O-O 13. Bxd7 Nxd7 14. Nc6 Qe8 15. Nxd5 Bd3 16. Nc7 Nb6 17. Nxe8 Nxa4 18. Nc7 Bxf1 19. Kxf1 Nb6 20. Nxe7+ Kh8 21. Nxa8 Rxa8 22. Bd2

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Pawn promotion:
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