The Colle-Zukertort System is a variant of the Colle System for white, and is distinguished from the latter by a queenside fianchetto (b3 and Bb2).

The Colle-Zukertort System is a variant of the Colle System for white, and is distinguished from the latter by a queenside fianchetto (b3 and Bb2). It is named for Edgard Colle and Johannes Zukertort. In the high-level play of more recent times, Artur Yusupov has been a major proponent of the opening.

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