En la década de 1980, la variante Petrosian-Smyslov 4...Cd7 en la Caro-Kann era enormemente popular. Karpov la empleó en varios duelos por el campeonato del mundo contra Kasparov y en incontables partidas de torneos de elite. En la actualidad Anand, Morozevich, Ivanchuk y Bologan emplean la línea con regularidad. El autor ha jugado con éxito 4...Cd7 en gran cantidad de partidas y muestra nuevas y desconocidas jugadas, ideas y análisis.
The Caro-Kann Defence is named after the English chess master Horatio Caro (1862–1920) who lived in Berlin and the Austrian player Marcus Kann (1820–1886). However, the move 1...c6 was not particularly popular until the 1920s, when both Jose Raul Capablanca and Aaron Nimzowitsch took up the opening. When, in 1960/61, Botvinnik was looking for a reliable defence for his WCh matches against the feared sacrificial attacks of Mihail Tal, he chose the Caro-Kann. Tigran Petrosian and Anatoly Karpov were two other world champions who adopted 1...c6 in their repertoires.
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