The inclusion of h6-Bh4 also has advantages for White, since the bishop can go to f2.
1. e2e4  1... c7c5  2. g1f3  2... d7d6  3. d2d4  3... c5d4  4. f3d4  4... g8f6  5. b1c3  5... a7a6  6. c1g5  6... e7e6  7. f2f4  7... h7h6  8. g5h4  8... d8b6  9. a2a3 This move is White's best attempt to gain an advantage. 9... f8e7 