What is the strongest continuation for White?

ICC tourney 1635 (12 3), Internet Chess Club
Analysis of john2001plus (1702) vs. IAlwaysWin (1561)

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

(white to move) 1. Nf3 d5 2. d4 Nf6 3. c4 c6 4. e3 g6 5. Nc3 Bg7 6. Bd3 O-O 7. O-O Nbd7 8. b3 Re8 9. cxd5 cxd5 10. Bb2 a6 11. a4 b6 12. Rc1 Bb7 13. Qe2 Ne4 14. Rfd1 f5 15. Nd2 e5 16. dxe5 Nxe5 17. Bxe4 dxe4 18. Ndxe4 Qe7 19. Nd6 Red8 20. Nxb7 Qxb7 21. e4

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