Karstedt was also the discoverer of the K+B+S vs K+Q fortress (wKh1, Bg2, Se4) which is mentioned, for instance, in the June 2006 issue of BESN and is explained in details on Roberto Stelling's website.
Tom Morrell claimed to have discovered another K+B+S vs K+Q fortress (wKf2, Bf3, Sg2) but this claim is not sustained by the Nalimov database.
A charming endgame study by Karstedt was recently posted on ChicagoChess blog.
Karstedt, Max Arn. K. S. A.Anderssen MT, 1919 2nd HM 
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