page_title: Burr puzzle
section_title: Chuck
hierarchical_section_title: Burr puzzle / Known families / Chuck
caption_attribution_description: English: Chuck Burr Puzzle
context_page_description: A burr puzzle is an interlocking puzzle consisting of notched sticks, combined to make one three-dimensional, usually symmetrical unit.
  These puzzles are traditionally made of wood, but versions made of plastic or metal can also be found. Quality burr puzzles are usually precision-made for easy sliding and accurate fitting of the pieces.
  In recent years the definition of "burr" is expanding, as puzzle designers use this name for puzzles not necessarily of stick-based pieces.
context_section_description: The Chuck puzzle was invented and patented by Edward Nelson in 1897. His design was improved and developed by Ron Cook of the British company Pentangle Puzzles who designed other puzzles of the family.
  The Chuck consists mostly of U-shaped stick pieces of various lengths, and some with an extra notch that are used as key pieces. For creating bigger Chuck puzzles (named Papa-chuck, Grandpapachuck and Great Grandpapachuck, by Cook) one would need to add longer pieces. The Chuck can also be regarded as an extension of a six-piece burr of very simple pieces called Baby-chuck, which is very easy to solve. Chuck pieces of different lengths can also be used to create asymmetric shapes, assembled according to the same principle as the original puzzle.
caption: A Chuck puzzle
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