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  9. g5h4  9... b8a6  10. f3d2  10... c8d7  11. a2a3 