I didn't have a nice wooden set for this so I just drew a grid on the nearest paper I had, which happened to be bookshelf assembly instructions lol.
This puzzle was diabolically difficult. I'm not sure how much of it is because my solving grid was Not Great (I'm planning to see if I can rig something up with magnets), or if this config is actually this difficult.
The config itself is like 4 diagonal squares cut out, but reverse the two inner ones. So you have SW and NE corner of the outer square, and NW and SE corner of the inner square. This leads to an asymmetric space in the center where the X piece will not fit. However, it's perfect for F and W. The tricky thing is really placing F, X, and W without screwing up your modularity around the edgefrom the very start. Maybe you can tell. but F would fit just as well facing south; it actually fits equally well in all the slots. And W fits only in NE and SW, but it can face either direction in both slots, plus it can translate up or down in each place.
All of these things are tricky because while they give you flexibility, it's a false sense: they all fuck up your modularity of left-over pices, as well as space for X. I wasn't able to solve this until I stopped trying to make X adjacent to any of the "null" spaces. I'd like to say after that inghit, it got easy, but it still didn't.
I think it took me about 3 hours to solve this. I highly, highly, doubt it's a unique solution, but I wouldn't be surprised if there's under 100 solutions (not counting rotation, reflections, etc).
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