The Colle System is a chess opening strategy for White introduced by Belgian Edgard Colle in the 1920s. Also known as the Colle–Koltanowski system, played frequently and further developed by George Koltanowski, this variation of the Queen's Pawn Game is characterised by a systematic if modest development of White's minor pieces to support a quick pawn move to the e4 square. It is solid, but inflexible.
Ignoring Black's responses for the time being, the typical plan is as follows: 1.d4 2.e3 3.Nf3 4.Bd3 5.0-0 6.Re1 7.c3 8.Nbd2 9.e4, with White rearranging his move order appropriately. It is a perfectly solid scheme of development, but, inflexibly applied, it cannot offer more than equality against a vigorous Black response. It may be a good tool for avoiding book variations, for Blitz play, or for forcing opponents to think for themselves early on. These days it is considered totally innocuous, and is rarely seen at Master level or above.
Read more about Colle System: Colle–Zukertort System, Strategic Plans, Games
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