Hi,
In case you are interested, we have posted a compact TLA+ version for the N=4 and W=40 stone puzzle as an example of our Logic Calculator: (1. Click on the Formalism Menu on the right and choose TLA+. 2. Now click on the Examples Menu and choose the StonesPuzzle entry.)
We also have a generic B solution for arbitrary weight and number of pieces. We will try and translate it to TLA+ and post it as another example on the site.
Greetings, Michael Leuschel
I just posted in the CodePlex repository a TLA+/TLC solution to this problem for arbitrary weight of stone and number of pieces. The repository is at
Click on Source Code > examples > Stones. However, I recommend trying to write such a solution yourself before looking at mine.

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