What is the best plan for Black?

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WilliamRDavis (1665) vs. john2001plus (1737), 900+10

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

(black to move) 1. d4 Nf6 2. Nf3 e6 3. Nbd2 d5 4. e3 c5 5. c3 Be7 6. Bd3 O-O 7. O-O Nc6 8. dxc5 Bxc5 9. e4 Qc7 10. exd5 exd5 11. Nb3 Bb6 12. Bg5 Ne4 13. Bh4 Bg4 14. h3 Bh5 15. g4 Bg6 16. Kg2 Rae8 17. Rc1 Qf4 18. Nbd4 Bxd4 19. Nxd4 Nxd4 20. cxd4 Nd2 21. Bg3 Qh6 22. Bxg6 Nxf1 23. Bd6 Qxg6 24. Bxf8 Qe4+ 25. Kg1 Ne3 26. fxe3 Qxe3+ 27. Kg2 Kxf8

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Options:
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Pawn promotion:
	- Queen
	- Rook
	- Bishop
	- Knight

Click here for 21. Bxg6
Click here for 21. Bxg6