An only move, but more than sufficient.
1. e2e4  1... e7e5  2. g1f3  2... g8f6  3. b1c3  3... b8c6  4. f1b5  4... c6d4 Rubinstein's move is considered to be the most reliable weapon against the Four Knights. 5. b5c4  5... f8c5  6. f3e5  6... d8e7  7. e5f3  7... d7d5 In return for the pawn(s) Black takes over the  initiative thank to his better developed pieces. 8. c4d5  8... c8g4  9. d2d3  9... f6d7  10. c1e3  10... d7e5 Black will either regain one of the pawns and keep the  initiative, or White will have to come up with something creative. 11. d5f7 Creative, but not good.