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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.

Q

Q

Q

Q

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

  Submitted by Brian Smith    
Rating: 3.0000 (3 votes)
Solution: (Hide)
One solution is below. Others can be found in the comments.
+-+-+-+-+-+-+-+-+
|        B B    |
+ + + + + + + + +
|      B B      |
+ + + + + + + + +
|W W            |
+ + + + + + + + +
|            B B|
+ + + + + + + + +
|          B B B|
+ + + + + + + + +
|  W W          |
+ + + + + + + + +
|W W W          |
+ + + + + + + + +
|W W            |
+-+-+-+-+-+-+-+-+

Comments: ( You must be logged in to post comments.)
  Subject Author Date
Some ThoughtsPuzzle ThoughtsK Sengupta2023-02-22 00:59:47
re(2): No Subjected bottemiller2008-03-25 11:09:08
re: No SubjectCharlie2008-03-25 11:03:23
Solutionre: No SubjectDej Mar2008-03-25 10:59:15
SolutionSolutionDej Mar2008-03-25 10:47:24
No Subjected bottemiller2008-03-25 10:32:46
Some ThoughtsAlmost, but not quiteCharlie2008-03-25 10:18:36
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