Explore precalculated six-piece burr puzzles

This site was inspired by a page in the book Puzzles Old & New, with the title Super Burrs - The Fearsome Four. It contained a black and white drawing of four six-piece burrs layed out as shown in the picture below. They were claimed to be higher level burrs and it was the first time I had seen any higher level burrs. Needless to say, I made the pieces out of wood to have a set of my own. The challenge - however - there were no solutions in the book. This brought on the creation of a six-piece burr puzzle solving computer program. One thing led to another and voila, the burr puzzles site was born. The reason the program was written was because I could not solve Bill's baffling burr, the computer program confirmed this. Further studies revealed that it was published wrong. Later I found it published correctly in Coffin's Puzzling World of Polyhedral Dissections.

The Fearsome Four			Other Burrs
	Coffin's Improved Burr Level 2.3		An animated version of this image is also available (830KB, takes forever to load)   Solid Burrs Notchable Higher Level Burrs General Higher Level Burrs
	Coffin's Interrupted Slide Level 3.2.2
	Bill's Baffling Burr Level 5
	Philippe Dubois' Burr Level 6.4

Definition: The Level indicates the number of shifts required to remove a piece. For example a level 7.4 requires seven moves for the first piece to be removed and 4 more for the second piece.