1. c2c4  1... e7e6  2. b1c3  2... d7d5  3. d2d4  3... h7h6 A curious move that has become popular recently. The idea is to avoid the development of the white bishop to g5. 4. g1f3  4... g8f6  5. c1f4  5... f8d6  6. f4d6 