What is the strongest line for White?

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john2001plus (1843) vs. Rescuebots (1659)

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 c6 3. c4 Bf5 4. Qb3 Qd7 5. Ne5 Qc7 6. cxd5 cxd5 7. Nc3 e6 8. Bf4 Qc8 9. e4 dxe4 10. Bb5+ Nc6 11. d5 exd5 12. Qxd5 Nge7 13. Qxf7+ Kd8 14. Nxc6+ bxc6 15. O-O-O+ Bd7 16. Bc4 a5 17. Be6 Nd5 18. Nxd5 cxd5+ 19. Kb1 Be7 20. Bxd7 Qxd7 21. Rxd5

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Pawn promotion:
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