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#1: Liz P (Lizteach) on Aug 25, 2010 [SPOILER]

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Thanks for your entry.

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thanks for entry, Kai

I did a fair bit of 2-way logic on this one.

Once you're stuck from line & color logic, look at R12. The 6 cannot go on the right, or there is a contradiction on R13. More line logic gets you most of the way there. Then it gets tricky.

An argument could be made that some edge or zig-zag logic can be used, starting in R23C11, because of all the lone 2 clues with a 1 on each end of that zig-zag. This does allow the puzzle to be solved, but could potentially be considered "guessing." Alternately, it can be worked out with more 2-way logic:

R22: if the remaining 2 is in C17&18, R33 doesn't work. Those are white. More line logic.
R18: If C10 is black, C 8 & 9 must also be black. This is a contradiction. C10 is white. A little more line logic.
R18 again: If C 8 & 9 are black, it creates a contradiction in R16 & 17. C8&9 are white. A little more line logic.
C15: If R21&22 are black, it creates contradictions in R25 and in C17. R21&22 are white.

The rest solves with line logic.

Found to be logically solvable by Gator.

Very hard puzzle. I thought it was an angry man.

logically solved.

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