It's usually difficult to know if the ...h6 move is useful; I have doubts about this in several defenses. Many players prefer to take on c3 right away. Others choose 8...Bb4.
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  8. a1c1 