8 Queens

http://www.basswood.com/oss/8queens/index.html

Basswood Associates

8 Queens is a classic puzzle in which you simply try to place eight queens on a standard chessboard so that no queen can attack any other. No two queens can share the same horizontal, vertical, or diagonal line. If some queens have Xs through them, that means they can attack each other, so you'll have to move them around. New in this version is the 8 Queens Solution Browser, which allows you to browse all 92 solutions to the puzzle. You also can place some queens on the board and then browse for solutions containing that configuration.