1. d2d4  1... d7d5  2. c2c4  2... e7e6  3. b1c3  3... a7a6  4. c4d5  4... e6d5  5. c1f4  5... g8f6  6. e2e3  6... f8d6  7. d1f3 A rare move that caught the players with Black by surprise. 7.Bg5 and 7.Bxd6 are more common.