London System Other Variations Clearance in Chess

In the London System other variations clearance, “clearance” means sacrificing or advancing a pawn to remove a piece’s or pawn’s blocking presence so your pieces can access a key file, diagonal, or square. A defining feature is the London setup (often with d4, Bf4, and e3) where you later clear the c- or d-pawn structure to open lines for your bishop and queen. In other variations, the clearance target changes—sometimes it’s to open the c-file, sometimes to free the dark-squared bishop or queen’s path.