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Are you Karl Colditz, author of the books below?
Lehr-, Übungs- und Testbuch der Schachkombinationen. by Karl Colditz Lehr-, Übungs- und Testbuch der Schachkombinationen by Karl Colditz Einführung in das Schachspiel. by Walter Wollenschläger Wir lernen Schach by Helmut Born Schachstrategie by Alexander Koblencs


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