Simon proving his peg solitaire solution:
In a game of peg solitaire, if you win you must end up on one of these 5 points! This analysis was a little more difficult than with the pyramid. Because in the pyramid, I ended up with a symmetric picture whereas with this one I ended up with an asymmetric picture. So I had to do one more step of removing all of the x’s that break the symmetry:
Geeks out of the box 