What is the best continuation for White?

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Analysis of john2001plus (1870) vs. bigpawn63 (1521)

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

(white to move) 1. Nf3 d6 2. e4 e5 3. d4 exd4 4. Nxd4 Be7 5. Nc3 Nf6 6. Bc4 O-O 7. O-O Nbd7 8. f4 Nb6 9. Be2 c5 10. Nb3 a5 11. a4

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