11. Bf4 is the most challenging response when faced with modern Black theory where Black does not castle queenside. In earlier theory, when Black planned to castle queenside, Bd2 was almost equivalent. The other alternatives offer little for White.
For explanation of theory tables see theory table and for notation see algebraic notation.
1.e4 c6 2.d4 d5 3.Nc3 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. h4 h6 7. Nf3 Nd7 8. h5 Bh7 9. Bd3 Bxd3 10. Qxd3 e6
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