Re: [math-fun] GCHQ puzzle

It’s a QR code. I wrote an iterative solver in Mma that gets a solution in about 10 iterations starting from a random 25x25 grid. I didn’t include the given black squares as constraints, but a fair fraction of the solutions are consistent with those constraints. -Veit

On Dec 15, 2015, at 7:08 PM, rcs@xmission.com wrote:

Has anyone done the GCHQ puzzle yet? The grid & constraints are at

http://www.bbc.com/news/uk-35058761

I noticed one row was completely specified by the information supplied.

Rich

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