The multi-purpose London System is characterized by the algebraic moves
d4, Nf3, Bf4, e3, c3, Nbd2.
It first came to prominence as a way for White to meet hyper-modern
setups in London in 1922 (see London V., East
Indian Def.) but lacking aggression the system is nowadays associated
more often with Black (eg. London V., Anglo-Slav Def.
or London V., QP Game).
Can be used (as White) against all except perhaps 1..c5, 1..e6 and 1..g6.
1.P-Q4.., 2.Kt-KB3.., 3.B-B4..,
4.P-K3.., 5.P-B3.., 6.QKt-Q2..