1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. b1c3  3... f8b4  4. d1c2 A principled line in the  Nimzo-Indian defense which has been tested at world championship matches. 4... e8g8  5. a2a3  5... b4c3  6. c2c3  6... d7d5  7. c1g5  7... d5c4  8. c3c4  8... b7b6  9. a1d1  9... c8a6  10. c4a4  10... h7h6  11. g5h4  11... d8d7 Black's lead in development is translated into a  seemingly equal endgame. 12. a4c2  12... d7c6  13. c2c6  13... b8c6  14. h4f6  14... g7f6  15. e2e3  15... a6f1  16. e1f1  16... c6a5  17. g1f3 