1. d2d4  1... g8f6  2. c2c4  2... g7g6  3. b1c3  3... d7d5  4. g1f3  4... f8g7  5. h2h3 Who would have thought that after so many years of analysis, the Grunfeld Defense would be refuted by such an innocent move $2 Of course, I'm kidding. Everything still works fine with this excellent option for Black. But White's move is still curious, especially in this move order. We will get a transposition to more conventional lines in a few moves, and the idea of the pawn advance will become clearer. 5... e8g8  6. c4d5  6... f6d5  7. e2e4  7... d5c3  8. b2c3  8... c7c5  9. f1e2 Now White's idea is easier to understand. The pawn on h3 prevents the development of the bishop on g4. Both players follow a very theoretical line. 9... b8c6  10. c1e3  10... c5d4  11. c3d4  11... d8a5  12. e3d2  12... a5a3  13. d4d5  13... c6e5  14. e1g1 Sacrificing an exchange that is not accepted by Erigaisi. 14... c8d7  15. a1b1  15... d7a4 