#1




Request for helping to solve the problems in vol. 1
I received the vol. 1 book a couple months ago. I like the book but there are several problems that I could not solve. Could anyone offer help? Here are the pictures that I have solved so far (which are in page 97, 125, 138 and 198 respectively), thanks!
Last edited by johncw82; 08022014 at 07:32 PM. 
#2




Would you mind showing the clues for each puzzle? There are a lot of willing helpers on this site, but if we don't have the book handy, we'll need the clues.

#3




The hints are uploaded

#4




Thanks for the clues!
I took a quick look at the first one and got the following: .75  Scott  HOPN  Manufacturing 1.00  Derrick  AMBR  Pharm 1.25  Brett  CFWT  Tech 1.50  Leslie  GGML  Financial 1.75  Connor  TLVU  Energy I think this is consistent with the clues. To get this, I noticed that your grid only had two alternatives for HOPN and pharma. Clue 1 says that HOPN and pharma cannot be in the same row, so there are only two alternatives for that pair. To save time, I just chose .75 for HOPN to see what would happen, and it led to a "solution." Then I checked that result against the clues, and it seemed consistent. I was expecting to get either a conflict or a bunch of empty rectangles that usually mean a mistake was made somewhere. If I got one of those results, I would have just chosen the other alternative for HOPN and pharma. Does the book state somewhere that each solution is unique and each step in the solution only requires logic (no guessandcheck)? If the puzzles in the book are like the ones in the online library, there should be a way to deduce the next step without guessing. 
#5




Quote:
Every puzzle in this book is solvable through logical deduction alone; trial and error and "forward guessing" are never required for a successful solve, though you are welcome to use these methods if you like! It seems that some of the problems may have more than one solution or cannot be solved. I don't know if it happens or I miss something during solving the problems. 
#6




I tried your second example, and I got the same result as you did. I guessed and got this solution:
Balloons  Carter  Famnar (sp?)  Student Clowns  Emma  Lipton  Retirement Dogs  Spencer  Garston  SuperSaver Horses  Braden  Pollis  Premium Sunsets  Julius  Neville  Economy This seems to be consistent with the clues. However, if Carter and Julius are swapped, I also get a solution that seems to be consistent. Guessing violates the logical deduction principle, and nonuniqueness violates the uniqueness principle. So ... I am probably missing some interpretation of the clues that would give us another X in those empty rectangles on the left. 
#7




I tried your third example, and I got the same result you did. I could see from your grid that Puyallup could only be June 11 or 14, so I guessed Puyallup = June 11, and I got the following:
June 8  8:30  Isanti  Zip Line June 11  10:45  Puyallup  Volcano June 14  12 noon  Ephrata  Snorkeling June 17  6:00  Watonga  Horseback June 20  2:30  Barnhart  Rain Forest Again, this seems to be consistent with the clues unless I missed something. I didn't look for another "solution." These puzzles from the book have a different clue structure, so maybe there is some logic that I'm missing. 
#8




Finally, I tried your fourth example, and I got a result that was very close to yours. I was missing a few Xs shown in your grid, but the rest was the same.
I guessed that Music Ally was on Sunday, and I got the following: 0  Saturday  Komedie Kiev  Gibson 2  Friday  Old Siam  Burdette 4  Thursday  Aunt Agony  Grand 6  Wednesday  Two Towers  Roxie 8  Sunday  Music Ally  Porter This seemed consistent with the clues. Just like the other examples, this one was just one X away from a solution. In this case, there were several places where a single X led to the solution shown above. That was surprising given all the open spaces in the partial solution. I didn't look for another solution. The missing piece of logic is probably the key to ensuring a solution without guessing AND uniqueness. Last edited by zenobia43; 08042014 at 08:07 PM. 
#9




Thanks for your help! It really helps a lot.
I think that if we solve a problem by guessing, it is not called "logic puzzles". There must be some clues that have not been stated, which I hope the "designer" of the problems can clarify that, by posting the new clues on the Web. 
#10




I took the last of the four and literally found 15 solutions that fit every single clue. Given that four of the other five threads in this forum also mention two or three of these puzzles, and all the attempts so far at solutions come down to making a guess and the solution working out, it seems more likely there is a missing clue.
(When there is a missing clue, any guess can lead to a valid solution  assuming all invalid solutions have been marked.) 
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