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I am looking for information about a 9 square puzzle. Is it possible to have the numbers 1 to 9 positioned in a 9 square grid in a formation so that the numbers are placed so no adjacent number is next to it horizontally, vertically or diagonally
i.e. 4 2 9
8 6
3
as you can see it is quite a challenge. I may have been mistaken but I believe I have seen it completed if so can anybody enlighten me.
thanks
john