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I have player "slitherlink" (or "Loopy" as it is sometimes called) generally on a 20x25 grid, so I don't finish too quickly.

However I have come across a puzzle (seed was not recorded), that MUST be solvable, but every attempt (2 dozen or so times) results in a impossibility.

Attached is a photo of the corner of the puzzle. The inconsistency happens while solving this corner, there has been no need to leave the bounds marked, before it fails. There are 2 zero squares, and a couple of 3-3 3-2-3 patterns to start from.

This is failure is driving me crazy, and I have been very very cautious in checking each of my moves.

slitherlink problem

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I didn't get any contradictions, but up to here was uniquely solvable (at least by my reasoning, if I didn't make a mistake) using the clues in the demarcated region. Hope this helps!

Partial solution
Click for higher-resolution image. I used this site to input the grid and draw my solution.

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  • $\begingroup$ 3-3's must contain the middle edge, otherwise you have a box. $\endgroup$ – JMP Feb 11 at 10:55
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    $\begingroup$ @JonMarkPerry they also must contain the outermost edges, otherwise you have another invalid position. But I only made deductions in the indicated region from the question. $\endgroup$ – boboquack Feb 11 at 21:28
  • $\begingroup$ Okay I have found one point I was making a stupid mistake! At this 3! 111 1 3 <--- Once I had that the rest came out exactly the same.. Simply point i was making a single mistake over and over again! Thank you $\endgroup$ – anthony Feb 12 at 2:42

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