1. d2d4  1... d7d5  2. c2c4  2... c7c6  3. g1f3  3... g8f6  4. b1c3  4... e7e6  5. c1g5  5... b8d7  6. e2e3  6... d8a5 The Cambridge-Springs Variation is a more solid choice for Black than the complications of the Botvinnik System with 6...dxc4. For those interested in classic games with this system, I suggest studying games 7, 9 and 11 of the match Capablanca vs. Alekhine. 7. c4d5  7... f6d5 