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The Chess Tactics Detection Workbook by John Emms, Volker Schlepütz. He has a PhD in economics from the University of Distance Learning Hagen and at present he is an instructor for economics at the University of Applied Science, Hamburg.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.