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No Safety from the Queen (Posted on 2004-09-23) Difficulty: 3 of 5
Given a 5x5 chess board, place the fewest number of queens possible on the board such that no queens are under attack but every other space is under attack.

See The Solution Submitted by logischer Verstand    
Rating: 3.0000 (7 votes)

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A075324 | Comment 6 of 13 |

People were giving solutions for other board sizes, which got me thinking, "Hey this is a sequence.  It's sure to be in the OLEIS"

There is also a link to the numbers of solutions. 

7 is indeed unique and 8 does have 91 solutions.  Charlie -- you 'da man.


  Posted by Jer on 2004-09-23 12:17:40
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