When I co-authored "Win with the London System" I never suspected that it might get used as a weapon against my home planet. But according to the USCF site that's what's happening right now.
After the moves 1.d4 Nf6 2.Nf3 d5 3.Bf4 (Dia), this is the position:
I am a little curious what will be the alternatives for Earth. Black's main options are 3...c5, 3...e6, 3...c6 and 3...Bf5 but also 3...g6 is a good move, and as far as I know nobody has come up with a fully convincing reply to 3...Nh5!?.
Maybe I will be following this game?
Update October 7th
Earth's alternatives now have been published. 3...e6 and 3...c5 were not surprisingly on the list. Also 3...Bf5 is a recognized system (but one which can easily lead Black into difficulties). Only 3...Nc6 was a surprise. It's a fairly rare move with a poor score (White scores 69% in MegaBase 2008) and until recently with no leading protagonist. However, it should be noted that Bareev recently won a game against GM opposition with the move. The position after 3...Nc6 more frequently arises from the move-order 2...Nc6 3.Bf4 Nf6.