1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. g1f3  3... d7d5  4. b1c3  4... f8b4  5. c1g5  5... h7h6  6. g5f6  6... d8f6  7. d1a4  7... b8c6  8. e2e3  8... e8g8  9. a1d1 A mysterious rook move, as Nimowitsch would have called  it. The idea is to be prepared for Black's main operation: capture on c4,  followed by e6-e5. In the meantime White tries to save a tempo on the  capture on c4 and does not want to move his bishop. 9... f8d8 