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 kovukun -> Classic Slitherlink (12/1/2012 8:29:40 AM) This is my first hard slitherlink I've ever tried, and I'm kinda proud that I made it this far. I had help here and there with the "show errors" option, but I never used it to help make a guess. When it showed a mistake, I undid the wrong line, and use logic to find out why. But it sucks that I've gotten THIS far, and am just stuck. I have a hunch that the next step lies somewhere in the 2 or 3 in the middle there... [image]http://i449.photobucket.com/albums/qq216/kovu-kun/puzzle.png[/image] As for the help... I don't want someone just saying "Oh, put a line here" and don't explain why. ^^; I'm here to find the next logical step, not to cheat and have someone fill in the answer. XD Thank you for your help!

 opnismry -> RE: Classic Slitherlink (12/1/2012 8:26:46 PM) Here's my logic process. I look around for "unstable" situations and say, 'well if there was a link here, then does anything bad happen?'. Similar is looking at when there isn't a link somewhere. Or consider all the possible combinations (when there are few such combos) and see if there's any similarities. I noticed this... Edit: there's also an X'd path that is in common with those two. [image]local://299708/75BBEE9696F64712955C8AF4494CB961.gif[/image]

 kovukun -> RE: Classic Slitherlink (12/2/2012 7:06:26 PM) Can you please explain the logic behind the second diagram, in regards to the red line in my picture? [image]http://i449.photobucket.com/albums/qq216/kovu-kun/puzzle2.png[/image] It turns out when I tried it out, it immediately came up wrong. That red line shouldn't be there, and I'm curious as to why you thought it should. Turns out your first diagram was correct. The one you thought was wrong. :/ That red line that you say should be there, shouldn't. (As it turns out, with a bit more logic, I was able to figure out the correct position of the lines, by ruling out the other positions, like you said. The correct layout is in blue. I'm still just confused as to why you think that red line should have been there. ^^; ) Anyways, thanks for your help, the two green lines you did offer did in fact help!

 opnismry -> RE: Classic Slitherlink (12/3/2012 4:55:45 AM) oh i put a red line to denote that a lane can't go there.

 Boodle -> RE: Classic Slitherlink (12/6/2012 10:44:53 PM) Hi kovukun, The line in red cannot exist, as it would mean the number 3 next to it is unable to have 3 sides. Therefore the line in green is the only correct option. Then one can see that the pink line must not exist, for if it did the yellow line would have to exist aswell and it has nowhere to go on the left hand side. [image]local://104391/D357302B5B914086B1A8E2AF09CCE16B.JPG[/image]

 Ichneumon -> RE: Classic Slitherlink (1/14/2013 7:30:53 AM) Sometimes a simpler way to invoke the same technique I just described is to realize that a necessary consequence of the "crossing rule" is that *every* column and *every* row in a Slitherlink puzzle *must* have an *even* number of lines in the completed solution (0, 2, 4, 6, etc.). In the partial solution here, the column with all the red and blue dots has seven known lines (e.g. the lines you cross as you move all the way down the column from top to bottom), and one "unknown" line (one place where we don't yet know if a line is there or not), the area marked with the turquoise rectangle. Since a column *must* have an even number of lines, it's easy to see that the unknown area *must* have a line in it so that our column's line count finishes out to be an even number (8) instead of the uneven number (7) it would be if we did not draw a line there. Other times this can be used to determine that, say, two remaining unknown "lines?" in a row/column must be completed with only a single line (as opposed to possibly 0 or 2 lines), something that can also provide clues to aid in solving the puzzle.

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