Re: [math-fun] GCHQ puzzle

1) Paint by Numbers, and Nonogram 2) Can't answer this. I believe most are computer generated, without regard for difficulty. Nick On 1/10/2016 10:41 AM, Veit Elser wrote:

I have two questions about this type of puzzle:

1) Does it have a name?

2) Are there heuristics for designing puzzles that are very hard?

-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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