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Old 02-05-2012, 04:06 AM
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bugman bugman is offline
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Join Date: Jul 2009
Location: Oceanside, CA or Aguadulce, Panama
Posts: 5
Default Problem solving Puzzle with no positive clue

I encountered a puzzle with all "nots" and no "is's" This left a grid with red x's but not enough on any rank or file to put in a green. What is the strategy to solve such a case without guessing? I redid the grid 10 times thinking I made a mistake and ended up having to make a guess.
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