1. d2d4  1... g8f6  2. g1f3  2... g7g6  3. c2c4  3... f8g7  4. b1c3  4... d7d5  5. h2h3 A favorite line of German  GM Bluebaum, used as well by a number of modern, young grandmasters. White takes control of the important g4-square in advance, thus securing his  center. 5... e8g8  6. c4d5  6... f6d5  7. e2e4  7... d5c3  8. b2c3  8... c7c5  9. f1e2  9... c5d4 