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#1: Tom O'Connell (sensei69) on Jun 5, 2014 [HINT]

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?

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Fun solve, Tom.

yeah, the 5 has to go up top, but you can't tell that in 2 moves ahead or less. hate to say it, but if that's your only way of solving this, it's "deep-lookahead". no guessing.

it's plenty easy enough to "see" the correct solution, but I'm not finding a moderate-lookahead way to get there. I'm not saying that there isn't one, just that I'm not seeing it.

Can't recreate it, but the 5 down creates conflicts with the 3rd row over to the left (i believe). I didn't start charting until much too late. Joe will come along and clean it up.

it makes a contradiction with the 3 in c16 if you were to put the 5 on the bottom. (3rd column to the right from the 5). Agreed. I didn't dispute that. but it's more than 2 steps look-ahead.

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Found to be solvable with deep lookahead by infrapinklizzard.

Whatever wins, however I think you can logically place the 5. I disagree.

Please give your specific steps.

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well, at least, I kept y'all busy :D

it was a fun solve, Tom! and a fun challenge to keep looking for alternate ways of solving :)

didn't realize it was a competition sgusa ;)...you can logically place the 5, just with 3 steps instead of 2. anyway, you've got your Old Style? you said you'd argue "whatever" as long as you had some....I'm leaving work and will stop for some Bud on the way home ;) (like my punnyness?)

lol thx whatever

I KNOW Tom O'Connell knows that I sometimes solve under an alt id, but does Tom King have any clue as to who I am? a challenging puzz got published today. #24686. check it out, and we can argue that one next. really, it's a tough solve and both Toms will like it. let's see what you got! jump in there too, Joe. I have a feeling this one will get a "?"...at any rate, it's infrapink-worthy.

Now I remember. It's ol' what's his name.

hahaha! N, I deleted fb a while ago also. your niece have a name? and is she still in the STL area? or just Mizzou. a couple of the younguns at work graduated MU this past May...

My niece and her daughter are both alumni. My niece worked her way up working for McGraw Hill. Not sure doing what.

did that puzzle, whatever, it is a nice solve :)

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Separately, smile logic can be looked at as a special case of edge logic.

Look at example 10 on http://webpbn.com/index.cgi?page=faq.html

Now do edge logic on the 8:
If it were to go into c1, then it would invalidate r1 (there would not be enough room for both 1s).
Therefore, it cannot go in c1 and then it solves with line logic.

Smile logic is basically recognising those situations where this sort of forcing happens. Simple smiles like examples 8 and 10 can be solved with edge logic. However, abstracting the concept allows us to apply it to a more dreadful situation like example 9.

Joe: Regarding "smile logic," I used it recently in a couple of puzzles and solved a couple using it. It is guessing. Albeit educated guessing. I accept it for what it is. If EL will solve it, I won't even attempt smile. Most of my uncompleted puzzles use smile logic, and I have worked through most of the 20x20. I'll revisit the puzzle when I have some time and truly notate it. Your third statement assumes that I was off by one. I may have been. However, I doubt three times. I'll recheck. Thanks for your time. Kurt agrees with you.

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