Hacker News frontpage submission with expanded metrics
3 Sep 14 4:42 PM · 9d ago · 2 posts · 2 sources · development 3 of 3
A Hacker News post presents the findings with an updated title noting 85,632 possible puzzles alongside the 12 grid variants.
baldino Blog author
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What people said 2 voices · verbatim
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> An elegant way of finding the 12 solutions I found the 12 solutions by hand. If you label the four numbers in the upper-left big square 1, 2, 3, 4 by symmetry of permutations, then there's a second symmetry you can apply. The second symmetry is that swapping rows 3&4 or swapping columns 3&4 preserves whether a board is a solution. You can use…
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I think B and C are identical (to symmetries) B B' C 1 2 4 3 3 4 2 1 1 2 4 3 3 4 2 1 1 2 4 3 3 4 2 1 4 3 1 2 2 1 3 4 2 3 1 4 2 1 3 4 4 3 1 2 4 1 3 2 B' is a label permutation of B: 1->3, 2->4, 3->1, 4->2. C is swapping the first 2 rows of B'. So they're equivalent. I used symmetry tricks over here https://hachyderm.io/@bazzargh/116286733347456470…
All 3 developments of Blog post enumerates 288 valid 4x4 sudoku solutions, 12… →
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