73-Cell Palindrome Sudoku

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73-Cell Palindrome Sudoku

Postby mith » Tue Dec 14, 2021 5:01 pm

Not sure if this has been discussed here. A 73-cell palindrome had been previously found for a toroidal grid, but last night I was able to construct a non-crossing 73-cell palindrome in a normal 9x9 sudoku grid:


(This is the maximum possible - you can only have an odd count of one of the digits, whichever is in the center of the palindrome. Not a hard puzzle, more a theoretical curiosity. Would be interested if such an example had already been found somewhere, google is failing me.)
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