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18 Queens (Posted on 2008-03-25) Difficulty: 3 of 5
On the 4x4 board below, two white and two black queens are placed so that no queens of one color attack any queen of the other color.

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Find a way to place 9 white queens and 9 black queens on an 8x8 chessboard in a similar fashion.

See The Solution Submitted by Brian Smith    
Rating: 3.0000 (3 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Solution re: No Subject | Comment 4 of 7 |
(In reply to No Subject by ed bottemiller)

Is this a better visual for your solution, Ed?

+---+---+---+---+---+---+---+---+
|   |   | Q | Q | Q |   |   |   |
+---+---+---+---+---+---+---+---+
|   |   |   | Q | Q |   |   |   |
+---+---+---+---+---+---+---+---+
| Q |   |   |   | Q |   |   |   |
+---+---+---+---+---+---+---+---+
| Q |   |   |   |   |   |   |   |
+---+---+---+---+---+---+---+---+
| Q |   |   |   |   |   |   |   |
+---+---+---+---+---+---+---+---+
|   |   |   |   |   | q | q |   |
+---+---+---+---+---+---+---+---+
|   | q |   |   |   | q | q | q |
+---+---+---+---+---+---+---+---+
|   | q |   |   |   |   | q | q |
+---+---+---+---+---+---+---+---+

  Posted by Dej Mar on 2008-03-25 10:59:15

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