Now the bishop controls both e4 and f5 squares and  f4-f3 seems impossible. White's plan is obvious-push c2-c4 and then flip  the knight to the e4 square. If this happens his queenside play will go on by itself.
1. e2e4  1... c7c5  2. g1f3  2... b8c6  3. d2d4  3... c5d4  4. f3d4  4... g8f6  5. b1c3  5... e7e5  6. d4b5  6... d7d6  7. c3d5  The new main line nowadays. 7... f6d5  8. e4d5  8... c6b8  9. a2a4  9... f8e7  10. f1e2  10... e8g8  11. e1g1  11... b8d7  12. c1d2  12... f7f5  13. a4a5  13... f5f4 [#] 14. f1e1 A strong novelty. White  prepares a blockade on the light squares. 14... d7f6 