8-Queen

教育益智遊戲國際象棋棋盤上放置8個皇后

This is the classic game of placing 8 queens on the chessboard, without one attacking another. Click on a square to place a queen. Re-click to remove the queen.

Seems Interesting!! To make the game more interesting, this game will place one queen on the board initially. This queen can not be moved or removed from the board. Your job is to place the remaining 7 queens on the board without attacking each other.

If you still can't solve it, you can ask the application to solve it for you. Although there may be more than one possible solution, this application will present only the first solution it'll find.

The eight queens puzzle has 92 distinct solutions. If solutions that differ only by symmetry operations (rotations and reflections) of the board are counted as one, the puzzle has 12 unique (or fundamental) solutions. (Source: Wikipedia)

This riddle is commonly used as an example problem for algorithm design.