1. d2d4  1... g8f6  2. c1f4 [%cal dc1f4][%c_arrow c1f4;keyPressed;none;from;c1;opacity;0.8;to;f4;persistent;false] A much more dangerous move than it seems at first glance. This version of the London System, moving the bishop before the knight, is more flexible for White, keeping more options open.