The product titled "Karpov v Korchnoi: The World Chess Championship 1981" by W.R. Hartston is a Taschenbuch format book in English. Published by Fontana in 1981, this book focuses on the topic of chess and provides a detailed account of the historic world chess championship between Karpov and Korchnoi. The author, W.R. Hartston, offers a comprehensive analysis of the matches and offers insights into the strategies and styles of the two renowned chess players. It is a valuable resource for chess enthusiasts and fans of the sport.