Web Paint-by-Number Forum

Topic #86: Edge logic

By Aaron Henry Yoshitake (airandfingers)

Topic #86: Edge logic

By Aaron Henry Yoshitake (airandfingers)

**#1: Aaron Henry Yoshitake (airandfingers) on Jan 26, 2008**

I registered on this site because I keep getting stuck with larger puzzles, and I believe it's because I use only line logic... I've tried to piece together what edge logic is from other posts, but I only know of a limited technique involving two adjacent lines with similar numbers.

Can someone please post a tutorial on edge logic, maybe with an example? I'd really really appreciate it.

Thanks!

P.S. Paint-by-number puzzles are great and I really like the atmosphere of this site. I'll be back!

try puzzle #23

start with the bottom row

On #23, try putting the 4 on the bottom row in different places, and you'll see the 2 in the second from the bottom row will prevent it from going in all but one place. Now this will only work well if you are dealing with big numbers or a lot of numbers. If you are working on a 40x40 puzzle and the bottom row just has 8 in it, you may be only able to eliminate a few squares. Having said that, it may be all you need to solve something.

Update: there is now a link to an "Advanced Puzzle Solving Techniques" page in the FAQ. This gives a detailed discussion of edge logic and other advanced tricks.

Nice Jan. :-)

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