A rare plan—I found only two games by amateur players in my database. A transposition to a professional game will occur later on. In the other games, Grischuk played the more natural 5.Nf3.
1. d2d4  1... g8f6  2. c1f4  2... d7d5  3. e2e3  3... c8f5  4. f1d3 This opening was played several times during today's matches. 4... f5g6 