Matchstick puzzles are transport puzzles in which a number of matchsticks are arranged as squares, rectangles or triangles.
The problem to solve is usually formulated as : move n (some specified number) matchsticks to make m (another specified number) squares (or triangles, or rectangles).
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... chair of philosophy at Halle for two years, he became, in 1833, professor at the university of Königsberg[?], where he remained till his death. In his last years he was ...