1. d2d4  1... g8f6  2. c2c4  2... g7g6  3. b1c3  3... d7d5  4. c4d5  4... f6d5  5. e2e4  5... d5c3  6. b2c3  6... f8g7  7. d1a4 The Grunfeld Defense is probably the toughest variation against 1.d4. This move is one of many possible attempts to confuse the opponent. While it's impossible to prove a scientific advantage, at least White can try to pose practical problems. This strategy will succeed in the present game. 7... b8d7  8. g1f3  8... e8g8 