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Comments on Puzzle #19761: WCP #117... For the teachers...
By valerie o..travis (bigblue)

peek at solution       solve puzzle
  quality:   difficulty:   solvability: line logic only  

Puzzle Description Suppressed:Click below to view spoilers

#1: Aldege Cholette (aldege) on Sep 12, 2012 [SPOILER]

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#2: Claudia (clau_bolson) on Sep 12, 2012
Yesterday it was Teacher's Day here in Argentina
#3: Jota (jota) on Sep 12, 2012 [HINT]
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#4: Tom O'Connell (sensei69) on Sep 12, 2012
thx for entry, Trav...nice solve too
#5: David Bouldin (dbouldin) on Sep 12, 2012 [SPOILER]
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#6: Kristen Vognild (kristen) on Sep 12, 2012 [SPOILER]
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#7: Norma Dee (norm0908) on Sep 12, 2012
Nice puzzle. did you check the apple for worms?
#8: Aldege Cholette (aldege) on Sep 12, 2012
David and Kristen,you two are way out there,i love it.:)
#9: Kristen Vognild (Kristen) on Sep 12, 2012
Mine referred to an old Atari/Activision game called Kaboom!
#10: David Bouldin (dbouldin) on Sep 12, 2012
Mine referred to the puzzle ;)
#11: valerie o..travis (bigblue) on Sep 13, 2012
thanks all :)
aldege,lol :)
david,lol :)
kristen, i use to love kaboom :)
norma, no worms :)
#12: Tom King (sgusa) on Sep 13, 2012
I had to backtrack several times (foolish errors). Fun solve.
#13: valerie o..travis (bigblue) on Sep 14, 2012
thanks tom :), i'll bet you're liking all these wcp #117 20x20 b&w puzzles :)
#14: Teresa K (fasstar) on Sep 14, 2012 [SPOILER]
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#15: valerie o..travis (bigblue) on Sep 15, 2012
thanks teresa, i remember that show :)
#16: Joel Lynn (furface1) on Sep 15, 2012
I did a lot of guessing to solve this. With the blots, I couldn't figure out anyplace to do edge logic after awhile.
#17: Joe (infrapinklizzard) on Sep 16, 2012
Joel, this is line logic solvable, but it takes some "advanced line logic", if you will.

The important thing to do is to make sure you dot every white space that you can. For instance, if you have a row with unknown, unknown, black, unknown; and the clues are 1,x (where x can be anything) then you know that the row should be unk, dot, blk, unk.

The reason is that the black in that row could be either the 1, or the beginning of the x. Either way, the pixel before it would be dotted.

Another thing to keep in mind - especially with blotted puzzles - is keeping track of which bunch of pixels is associated with which unfulfilled clue. A non-blot ferinstance is if you have in a row unk, blk, unk, unk, dot; and you figure out that the black must be part of a 2. The pattern is now unk, blk, unk, DOT, dot. No arrangement could be made where that pixel could be black.
This also sometimes works with larger numbers, but you must be aware of the next clue - if it will fit in that space, it kills this technique (eg. u, k, u, u, u, d; with a 3,x - that last u on the right will be a dot if the x is anything other than a 1, but if it's a 1, it could fit - so be aware!)

Another white-placing line logic technique is when two pixel groups are far away from each other and you have definitely determined which clues they are. If there are no clues between them, and even at full extension they cannot reach each other, any pixels between must be dotted.
This also works if it's the last or the first clue, and it can't reach the edge.

And a blot-specific one. The biggest problem with blots is that you don't know how long they are, so you often have to leave large spaces open that normally would yield to the hint above. However, (tho it's obvious, it's easy to overlook) it must end at or before the next dot - so keep track when you put in a dot somewhere to see if it blocks off some of the space that you had to leave open for a dratted blot. If so - Woohoo - you can mark more white!
#18: Vaggelis Kamaris (evag7651) on Nov 5, 2018
really nice
#19: Velma Warren (Shiro) on Jan 25, 2019
#20: BlackCat (BlackCat) on May 1, 2020
Quite fun and a lovely thought.

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