TechnicalImpulse

At the US Go Congress this week. Playing more serious games over a physical board than I have in years. #Weiqi #Baduk #Go

Cherry picking time.

I've been computationally searching for polycube puzzles. Exercise: find a 7-cube, 9 copies of which fit in a 4x4x4 cube. Bonus points for multiple solutions placing the singleton unfilled cube in different places. #math #puzzles #combinatorics

So there are 63 Bedlam siblings. They all have different numbers of solutions. The original puzzle has 19186 solutions. Its siblings range from 16457 to 30613 solutions. 2/2 #puzzles #combinatorics #block-packing

The Bedlam Cube has 7 chiral pieces. (Chiral = no plane of mirror symmetry.) Reflecting the whole set would, of course, have the same set of solutions (mirrored). But reflecting only some of them results in a whole new puzzle. 1/2 #puzzles #combinatorics #block-packing

It's well known that Sudoku can be written as an Exact Cover problem. But upon browsing Sudoku's lesser-known siblings here: www.nikoli.co.jp/en/puzzles/ it strikes me that many (most?, all?) are also equivalent to Exact Cover. Anyone done a comprehensive study? #puzzles #sudoku #combinatorics

Replaced my Jumbo Jaws with Mega Jumbo Jaws. Spoiler: they're not 10^6 times as big. Nonetheless, they let me finish the bottom of this 12" dia bowl that had been sitting on the shelf. Swamp maple, cracked and spalted. #woodturning #woodworking

Borromean Rings. Oak. Each ring is an oval, about 4"x7". #woodworking