Good move,as I should expect.The only other one I considered was 11...a5.
1 Nf3 ... Nc6
2 e4 ... e5
3 Bb5 ... Nd4
4 Nxd4 ... exd4
5 O-O ... Bc5
6 d3 ... c6
7 Ba4 ... d6
8 c4 ... Ne7
9 Nd2 ... O-O
10 a3 ... Ng6
11 f4 ... f5
12.b4
1 Nf3 ... Nc6
2 e4 ... e5
3 Bb5 ... Nd4
4 Nxd4 ... exd4
5 O-O ... Bc5
6 d3 ... c6
7 Ba4 ... d6
8 c4 ... Ne7
9 Nd2 ... O-O
10 a3 ... Ng6
11 f4 ... f5
12.b4
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