This JPG picture
Adjacency Grid
comes
From: William Wu of U. C. Berkeley on 10/24/2005
At: http://www.ocf.berkeley.edu/~wwu/riddles/intro.shtml
Source: http://www.ocf.berkeley.edu/~wwu/riddles/medium.shtml#adjacencyGrid
Arrange the numbers 1 to 8 in the grid below such that adjacent numbers are not in adjacent boxes (horizontally, vertically, or diagonally).
1
6 4 3
2 7 5
8
The arrangement above, for example, is wrong because 3 and 4, 4 and 5, 6 and 7, and 7 and 8 are adjacent.