Puzzle Description Suppressed:Click below to view spoilers

#1: emily theriault (emilyt) on May 21, 2004

great job

This one is still very hard, even though I've done it many times.

I must have done this puzzle 10 times by now, and it's still hard. One of the all-time classics.

Still a classic! Might be m favorite black and white puzzle on the site.

Even tough I've done many puzzles since first doing this one, it's still hard!

I've done done this puzzle maybe 10 times now, and it's still hard each time! Even though I remember some tings about the puzzle, I still get stuck.

I'm glad you like the puzzle, but having reread comments 2 through 6, I'm beginning to wonder if you're stuck in a slow infinite loop here. I think it might be because your loop counter is failing to increment - it seems to be stuck at ten.

I get to the last 10 or so blocks in the top left corner and have to guess where the first two on the third row must go. Am i missing something?

Heh. I guess I need to whack the counter upside the head.

Re #8: Yes, it's true that you can't get the UL corner using row-by-row logic. But you can prove that there is only one solution.

Well, I must have done this at least 11 times now, and it's still one of my favorite black and white puzzles on the site.

Wowser.. Yes... tricky.. good. Thank`s.

Nice!

That was surprisingly difficult. It took me three tries to finally get it.

Nice but not that hard.

Comment Suppressed:Click below to view spoilers

Nice! And it's the classic design.

I've gone at this one three times so far, and each time I've hit a "contradiction". Dagnabbit!

If you put the first "2" in row 3 as close as possible to the 1 that is already placed, you will find that the 11 in the row above will not fit (it will be broken). In the same way, you can eliminate that it doesn't go far to the right. Put a dot there. Try the 2 in the next 2 spaces (as far right as you can put it) and once again, the 11 won't be continuous.
Just by ruling out that first spot where it can't go, you can easily solve it by line logic the rest of the way.

I am on my third or fourth time around solving these puzzles (due to lack of new puzzles being published) and my last entry was apparently before I understood smile logic. The upper left corner can easily be solved through simple smile logic.

Ditto Adam's comments about the upper left corner. That's exactly how I solved it.

I jumped ahead to try a slightly larger puzzle than the ones I've been solving. This was my first in that class of sizes and it was a toughy but I got on the first (rather long!) try.

Very nice puzzle.

This puzzle really tripped me up at times. Quite tricky. I didn't think of using smile logic, so I wish I read the hints before solving. Adam's hint could have saved me some brainsweat. :-)

High marks for this one.

When I first got to this site, I started doing all the new puzzles as well as starting from the beginning and going through chronologically. Back then, I didn't have a clue about edge logic, smile logic, or anything but simple line solving. So I often wrote things like "had to guess," and similar thoughts. Then, as I got more advanced, I went back and solved many of them again (and I am still in the process) and amended or added new comments, hoping they may help future solvers.

This is one of my favorites. I know I solved and saved it before, about a year ago, but it showed up on my unsolved list.

lucky you teresa!

Really tough puzzle, but I did finally come back to it. Good job with this, took some other puzzles to give me "hints" for this one.

I didn't think I was ever going to get it right. I loved the challange more than anything as I'm not a star wars fan.

Comment Suppressed:Click below to view spoilers

Great puzzle, with a nice "long distance" smile technique at the upper left corner, right on the end of the puzzle. Certainly one of my favourites.

Comment Suppressed:Click below to view spoilers

very hard one. took me some time to solve it.

Difficult puzzle. It's so satisfactory to solve a hard one though.

Wow! Puzzle #8. Fun puzzle but not as hard as the early solvers made it out to be.

I should really go back and solve all of the "historic" puzzles.

I've noticed how the definition of hard has changed over time. This was not that bad. A little tricky at the end, but got it to solve.

At the time when this was posted, I don't think we had any users (including me) who had ever solved more than a couple dozen puzzles. Now I see 71 users who have solved more than 10,000 puzzles on this site alone. Standards of difficulty have change a lot.

I thought I might be the only one to do repeat solvings. When I was buying every pbn book that came out, as soon as I finished a puzzle I would erase it so it would be ready to solve again. :)

Quite difficult puzzle. I definitely guessed a few times, but was able to finish it.

Puede resolverse con lógica.

I did have to guess once. Other than that is was an interesting puzzle. Tough subject for such a small space.

It is solvable by line logic. Great puzzle.

This does not solve with line logic. Line logic looks at only one line at a time. At the end of line logic, you are left with the 11 in r2 and the two 2s in r3. You cannot finish these with only the row each clue is in, nor can you finish the crossing columns by looking only at one column at a time.

It requires "Smile" logic - a specific kind of edge logic - to finish. If the 11 were to go all the way left (or right), it would not leave room for one of the 2s in the row below. That means the left (or the right) pixel in r2 must be white. Then LL to finish.

See https://webpbn.com/solving.html for information on techniques that are not line logic.

Show: Spoilers

Goto next topic

You must register and log in to be able to participate in this discussion.