The Lomont Burr
Here are the pictures of the Lomont Burr, a 2x3x4 burr which requires 3 moves before any piece can be removed.
Click on any pictures for larger versions.
Copyright Chris Lomont 2002-2006. All rights reserved.
The design of the puzzle
Here are two renderings of the puzzle, and a piece diagram and a solution, all generated by my custom software before I actually built a physical version. Here is a link to a rendered video of the puzzle disassembling.