The London System is a chess opening that usually arises after 1.d4 and 2.Bf4, or 1.d4, 2.Nf3 and 3.Bf4. It is a "system" opening that can be used against virtually any black defense and thus comprises a smaller body of opening theory than many other openings. The London System is one of the Queen's Pawn Game openings where White opens with 1.d4 but does not play the Queen's Gambit. It normally results in a closed game. The line can be compared to the Colle System but whereas in the latter system, the queen's bishop remains on c1, the London System develops the bishop to f4 before closing the position, providing a more flexible approach.
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