London System

The London System is a chess opening that usually arises after 1.d4 and 2.Bf4 or 2.Nf3 & 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. Wikipedia
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