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At Least Three Difference (Posted on 2010-08-04) Difficulty: 3 of 5
Place the numbers 1-9 in the boxes so that the difference of each pair of numbers joined by a line is at least three. The number 8 has already been placed.

No Solution Yet Submitted by Brian Smith    
Rating: 5.0000 (1 votes)

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re: solution by reasoning | Comment 6 of 13 |
(In reply to solution by reasoning by Ady TZIDON)

Ady, you have reached the same solution which Charlie and I put forward, but we both used exhaustive search programs.  It seems that there might be an approach by reasoning (which some call "analytic").  Of course, trial-and-error probably eventually would find the solutions, but "analytic" usually portends some systematic shortcuts.  I'd be interested to see how you came to the solution.
  Posted by ed bottemiller on 2010-08-04 20:32:14

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