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 Four Squared (Posted on 2006-10-26)
Grid A                    Grid B
A   B   C   D             A   B   C   D
+---+---+---+---+         +---+---+---+---+
1  |   |   |   |   |      1  |14 |23 |34 |14 |
+---+---+---+---+         +---+---+---+---+
2  |   |   |   |   |      2  |31 |42 |26 |26 |
+---+---+---+---+         +---+---+---+---+
3  |   |   |   |   |      3  |22 |24 |44 |29 |
+---+---+---+---+         +---+---+---+---+
4  |   |   |   |   |      4  |12 |32 |19 |16 |
+---+---+---+---+         +---+---+---+---+
The numbers 1 to 16 are to be placed in grid A, so that consecutive numbers are not adjacent in any direction, including diagonally. Nor do they appear in the same row, column or any diagonal.

The number in each cell of grid B is the sum of the horizontal and vertical neighbors of the corresponding cell in grid A.

NB. The letters and numbers around the edge of the grid serve no purpose for the solver. They are to be used for identifying cells in the solution.

 See The Solution Submitted by Josie Faulkner Rating: 4.4167 (12 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
 re: computer solution | Comment 6 of 17 |
(In reply to computer solution by Charlie)

Hi Charlie,

The caveat "nor do they appear...... in any diagonal" was not included in my original puzzle. I was advised by one of the reviewers to add it to the puzzle.

Josie

 Posted by Josie Faulkner on 2006-10-26 17:42:44

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