Place 9 balls ("o") in the intersections of the grid below to achieve 10 straight lines, each line containing 3 and exactly 3 balls. You may assume, if you need, that each cell is a perfect square.

           +---+---+---+---+---+---+---+---+
           |   |   |   |   |   |   |   |   |
           +---+---+---+---+---+---+---+---+
           |   |   |   |   |   |   |   |   |
           +---+---+---+---+---+---+---+---+
           |   |   |   |   |   |   |   |   |
           +---+---+---+---+---+---+---+---+
           |   |   |   |   |   |   |   |   |
           +---+---+---+---+---+---+---+---+
           |   |   |   |   |   |   |   |   |
           +---+---+---+---+---+---+---+---+
           |   |   |   |   |   |   |   |   |
           +---+---+---+---+---+---+---+---+

pcbouhid,

Thanks for another good puzzle.  I personnally find that creating a problem, with no chance for misinterpretation, is impossible.  This is one of the main reasons for the peer review and that the quantity of puzzles I have submitted remains low.  (I spend months debating the wording.)

I welcome anyone who is willing to critique a problem and score it a "1" to write a better problem.  The site is open. 

Posted by Leming on 2008-10-15 16:25:41