What is the strongest move for White?

Casual Game, https://itsyourturn.com
John Coffey vs. Lee Edwards

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

(white to move) 1. Nf3 g6 2. d4 Bg7 3. c4 Nf6 4. Nc3 d6 5. e4 O-O 6. Be2 Nbd7 7. Be3 e5 8. Qc2 Ng4 9. Bg5 Qe8 10. Nd5 f6 11. Nxc7 Qd8 12. Ne6 Qe7 13. Nxf8 fxg5 14. Nxd7 Bxd7 15. Qb3 b6 16. c5+ Be6 17. d5 Bc8 18. c6 Nh6 19. h3 g4 20. hxg4 Nxg4 21. a4 Nf6 22. Nd2 Qc7 23. Qe3 Bg4 24. f3 Bc8 25. g4 a5 26. Nc4 Rb8 27. Na3

[ Flip the board | Reset | Options… ] Play chess online

 

Options:
	- allow legal moves only;
	- use short algebraic notation;
movement/animation speed: (slow) (fast)
	- show legal moves;

 

Pawn promotion:
	- Queen
	- Rook
	- Bishop
	- Knight