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First, Peter Krug talks about his illness. Then he shows a mate in 23, which he published in 2005 as a correction in ‘Die Schwalbe’.
This is because his mate in 18, which he published a year earlier, was a secondary solution.
This mate problem marks the new beginning of his chess composition. Incidentally, it did not receive any awards (presumably because of the many captures at the end of the solution).
Location: Elsbethen, near Schloss Goldenstein