1. c2c4  1... g8f6  2. g1f3  2... g7g6  3. b1c3  3... f8g7  4. e2e4  4... d7d6  5. d2d4  5... e8g8  6. f1e2  6... e7e5  7. d4d5 The  Petrosian system which was successfully revived by Vladimir Kramnik. 7... a7a5  8. c1g5  8... h7h6 