Burr Puzzle
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 What is the Burr Puzzle?  The burr puzzle is a 3-dimensional puzzle.  The simpliest one has two pieces in form of a C and one piece in form of an O.  You have to fit them together, so that you have a "knot".
Solution:

Burr Puzzles of Six Pieces top
The standard burr has 6 pieces. Solution:

A Burr Puzzle with an Empty Space     top
The following six-pieces burr puzzle is simpler. But it has one "mistake": There is an empty space inside. Solution:

Building of the Burr Puzzle    top
 ... If you would like to make the knot with three pieces you need three blocks of wood with the measurements 8cm x 6cm x 2cm. The holes in the middle have the measurements 6cm x 2cm x 2cm. The drawing on the left  with the cubelets will help you.
 .... You need 6 blocks of wood 6cm x 2cm x 2cm for the knot with six pieces.

Volume of the 6-piece Burr Puzzle     top
The burr puzzle is built of cubelets. You have to count them. Result: 104 cubelets form the burr.

References   top
(1) Pieter van Delft /Jack Botermans: Denkspiele der Welt, München 1980 (1998 neu aufgelegt)
(2) Computer-Kurzweil, Spektrum der Wissenschaft, Dezember 1985
(3) Jerry Slocum/Jack Botermans: Geduldsspiele der Welt, Augsburg 2005 [ISBN 3-8289-4949-5]

Burr Puzzle on the Internet    top

German
Peter Rösler
Holzpuzzles

Wikipedia
Mechanische Geduldspiele

Englisch

ISHINO Keiichiro
Puzzle will be played...

Bill Cutler Puzzles, Inc.
Puzzles  (Six-Piece BurrsRectilinear BurrsNon-Rectilinear Burrs)

IBM Research
Burr Puzzles

Rob's Puzzle Page
Interlocking Puzzles

Stewart T. Coffin
Larger (and Smaller) Burrs

Sue & Brian Young
Mr Puzzle Australia

Wikipedia
Burr puzzle, Mechanical puzzle

woodgears.ca
12 piece burr puzzle (12 identical pieces)

The American puzzle designer Bill Cutler found out with the help of a computer, that you can build the burr puzzles with a stock of 25 pieces in 341 ways (2).

The Dutch professor J.H. de Broer has systematically designed 500 pieces 6x2x2 and put them together as a burr. He found 69 versions of this take apart  puzzle (1).

Then mathematicians found with the help of a computer, that you can build burr puzzles with a stock of 369 pieces in 119 979 ways (3).

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