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#1: Beth (Shasta) on Apr 3, 2008 [SPOILER]

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This imsage did not jump out at me. Interesting to solve though.

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The ear is just turned, that's all. The left side of the puzzle was impossible to solve.

Not impossible. Check out the new "Advanced Puzzle Solving Techniques" link at the top of the "FAQ" page.

The left side is definitely solvable. I essentially used "edge logic" to help determine the position of the top blue squares in column 6, where the edge, rather than being the boundary of the puzzle, was an internal boundary formed by the parts of the puzzle already solved (all the columns to the right of column 6)

In a way I agree with Adam...it isn't solvable unless you do what I call "trial and error"...and as a great great surprise to me (it has never happened to me before)when I reached that point in the puzzle, I chose a square to arbitrarily color blue and the rest of the puzzle was completely solvable by ordinary methods!!!! On the first try! No reverts!!!! The square to color blue when all possible squares have been filled in by ordinary logic is square #6 in the first row...the entire rest of the puzzle quickly unfolds. Try it!

...and now I'm off to read about "Advanced Puzzle Solving Techniques". I checked out the BB when I first came several weeks ago, but that day I very much wanted to get solving so I left and never did get back to reading much of anything.

I'm very excited because I've never had lessons and hope this helps my perspective on some puzzles that I call Vast White Wastelands lol! How fun to maybe be able to finally solve some of them without all the tedium of the only way I figured out to do it!

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It was still fun to solve, as usual!

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cute

When line and color logic peters out, you are left with a rectangular unsolved block from c1-6 and r1-15. There are only two pixels marked within: r7c3-4 are blue.

This one can be solved with internal deep edge logic.

Edge logic is used on the edges of a puzzle and takes advantage of the fact that you know which direction any clue has to go (as it can't go outside the grid). Internal edge logic is the same, but using clues that are blocked by dots (or a different color) rather than the edge of the puzzle.

Edge logic is normally used to look at the effect on the row or column next to the one with the clue you're trying to place. Deep edge logic looks at rows even farther away.

Internal edge logic on the 7 in c6 says that it can extend from r1-7, r2-8, r3-9 or r8-15. Unfortunately, the overlaps mean that nothing can be definitively ruled out.

However, if you extend your looking beyond c5 to c4, you can see that the 7 cannot be in r8-15. If it were, it would produce a one-pixel vertical block in r12c4. (Blocked off by the 2s in r11&13). Since there is already a pixel marked above this, it could not be the 1 in c4, and thus is an error.
So, the 7 in c6 can only be within r1-9. c6r10-15 is white. The rest solves with line logic.

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Adorable

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