Edgard Colle and Johannes Zukertort were both masters and played from late 19th century to the beginning of the next. Though they are rarely mentioned as prominent players of that era, an entire opening carries their name, which is not something that many players can say. Colle certainly contributed enormously in implementing key ideas in this opening. Zukertort lost to Steinitz in the 1872 World Championship Match, and was very strong in the 1870s and 1880s. He often experimented with b3 ideas in various positions.
I would like to clarify that systems presented in this book that start with b3 we call Zukertort, while ideas connected with c3 we call Colle systems. Both systems are analysed in this book in detail. They often transpose into one another in terms of ideas. Moreover, both the Colle and Zukertort can be used against many setups. I have tried to do exactly that: find rare lines that can be deployed against many regular openings. These, of course, have been modernised and tailored to create unique and strong strategical play.
Milos Pavlovic "The Modernized Colle-Zukertort Attack: Fighters Repertoire"
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