What is the strongest move for White?

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Analysis of john2001plus (1938) vs. Gusev (1827)

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

(white to move) 1. Nf3 Nf6 2. d4 g6 3. c4 d5 4. cxd5 Bg7 5. Nc3 Nxd5 6. e4 Nxc3 7. bxc3 c5 8. Be3 Nc6 9. Be2 Qa5 10. Qd2 cxd4 11. cxd4 Qxd2+ 12. Kxd2 O-O 13. Rab1 a6 14. d5 Ne5 15. Nxe5 Bxe5 16. Rhc1 b5 17. f4 Bg7 18. Rc7 e6 19. Bc5 Re8 20. d6 Rd8 21. e5

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Pawn promotion:
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