P90 - Eight queens problem

This is a classical problem in computer science.  The objective is to place eight queens on a chessboard so that no two queens are attacking each other; i.e., no two queens are in the same row, the same column, or on the same diagonal.

Hint: Represent the positions of the queens as a list of numbers 1..N1..N.  Example: List(4, 2, 7, 3, 6, 8, 5, 1) means that the queen in the first column is in row 4, the queen in the second column is in row 2, etc.  Use the generate-and-test paradigm.