OK - the Einstein Puzzle is NOT a business problem BUT it represents a problem that is best solved by rules and/or constraints. The complete description can be found at http://www.stanford.edu/~laurik/fsmbook/examples/Einstein'sPuzzle.html and we will review the various solutions at the conference. I would have suggested the venerable Monkey and Bananas (MAB) but that one is way too easy and has already been solved many times over.
However, if each sponsor / vendor takes the time to have someone construct an elegant solution in whatever tool is deemed most appropriate, then the attendees can see how a fairly complex problem can be solved using whatever tool is handy. I'm sure that the times to run such a simple problem will be extremely fast but what we can see will be the elegance (or lack thereof) in each vendor's tool box.
Comment at will - but for now I haven't heard any suggestions whatsoever from anyone. :-) Puzzle # 2 should be a bit more complex and without the guidance of Einstein's Puzzle. More on that next month.