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  10. c3d4  10... b8c6  11. c1e3 