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.