What is the best continuation for White?

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Analysis of john2001plus (1880) vs. spiritracker (1289)

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

(white to move) 1. Nf3 d5 2. d4 Nf6 3. c4 e6 4. Nc3 Nbd7 5. Bg5 Be7 6. e3 Ne4 7. Bxe7 Nxc3 8. Bxd8 Nxd1 9. Bxc7 Nxb2 10. cxd5 exd5 11. a4 O-O 12. Ra2 Nc4 13. Bxc4 dxc4 14. Ke2 Re8 15. Rc1 Nb6 16. Bxb6 axb6 17. Ne5 b5 18. Rb1 f6 19. Nf3 bxa4 20. Kd2

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Click here for 18. Rac1.