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An article dealing with “Klan defensive retractors”, a new retro-kind (= a mixture of type Proca & Hoeg) invented by Klaus Wenda and Andreas Thoma is available for download! (PDF, 347K):
The article in German is available on Tomas Brand‘s retro-blog – http://www.thbrand.de/2015/03/26/vrz-klan/
E) 2…Ke8xQf8(Ke8)? 3.Qd1-f3 & 1.Qd8+ Sd1!
Diagram and solution for problem H is corrected by authors. PDF file is replaced.