1. d2d4  1... g8f6  2. c1f4 [%c_effect f4;square;f4;type;Interesting;persistent;true] A poisonous version of the London System, often used by Erigaisi. 2... g7g6  3. b1c3 In the traditional London System this move is unthinkable, since it's the pawn that occupies this square. But they don't make London players like they used to—this variation was once the choice of those who wanted a solid position to make a draw, and nowadays it's used by people who like to play for mate. 3... d7d5 A principled move. 4. e2e3  4... f8g7  5. h2h4  5... h7h5 Stopping the advance of the h-pawn. 6. g1f3  6... c8g4 [%c_effect g4;square;g4;type;Inaccuracy;persistent;true] I'm not a big fan of this move, as the bishop isn't particularly well placed here and the f3 exchange can help White's attack by opening up the g-file. 7. d1d2 [%c_effect d2;square;d2;type;GreatFind;persistent;true] An unpleasant move, preparing to take the knight off f3. 7... g4f3 Necessary, to avoid 8.Ne5 or 8.Ng5.