attogram/8queens

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    <h1>About the <a href="../">8 Queens puzzle</a></h1>
     <p>The eight queens puzzle is the problem of placing eight chess queens on
      an 8x8 chessboard so that no two queens threaten each other.
      <br /><br />
      Thus, a <a href="../solutions/">solution</a> requires that no two queens
      share the same row, column, or diagonal.
      <br /><br />
      The eight queens puzzle is an example of the more general n-queens problem
      of placing n queens on an nxn chessboard, where solutions exist for all
      natural numbers n with the exception of n=2 or n=3.
      <br /><br />
      ( from: <a target="8q"
               href="http://en.wikipedia.org/wiki/Eight_queens_puzzle"
               >http://en.wikipedia.org/wiki/Eight_queens_puzzle</a> )
     </p>
     <p><a href="../">Play 8 Queens Now!</a></p>
     More:
     <ul>
      <li><a target="8q"
       href="http://mathworld.wolfram.com/QueensProblem.html"
       >http://mathworld.wolfram.com/QueensProblem.html</a>
      <li><a target="8q"
       href="http://rosettacode.org/wiki/N-Queens#PHP"
       >http://rosettacode.org/wiki/N-Queens#PHP</a>
      <li><a target="8q"
       href="http://en.wikibooks.org/wiki/Algorithm_Implementation/Miscellaneous/N-Queens"
       >http://en.wikibooks.org/wiki/Algorithm_Implementation/Miscellaneous/N-Queens</a>
      <li><a target="8q"
       href="http://www.brainmetrix.com/8-queens/"
       >http://www.brainmetrix.com/8-queens/</a>
      <li><a target="8q"
       href="http://www.datagenetics.com/blog/august42012/"
       >http://www.datagenetics.com/blog/august42012/</a>
     </ul>
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