A Supergrandmaster’s Guide to Openings Vol.2: 1.d4, 1.c4 and Sidelines

London System and other systems

1.d4 Nf6 2.Bf4/Bg5 and 1.d4 d5 2.Bf4/Nf3 A few years ago, the London system was not considered an important opening - at best it was a side line.