1. c2c4  1... e7e6  2. b1c3  2... d7d5  3. d2d4  3... f8b4 An interesting order of moves, usually taking the game to a position usually arising from the Nimzo-Indian or the Ragozin Defense. 4. a2a3 A popular system, White doesn't mind the exchange of the bishop for the knight on c3 and even provokes it. 4... b4c3  5. b2c3  5... g8f6 