Logic Puzzle Forums Request for helping to solve the problems in vol. 1
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#1
08-02-2014, 06:50 AM
 johncw82 Junior Member Join Date: May 2014 Location: Hong Kong Posts: 4
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!
Attached Images
 198.jpg (154.0 KB, 23 views) 97.jpg (159.1 KB, 41 views) 125.jpg (146.0 KB, 22 views) 138.jpg (155.3 KB, 19 views)

Last edited by johncw82; 08-02-2014 at 07:32 PM.
#2
08-02-2014, 07:51 AM
 zenobia43 Senior Member Join Date: Mar 2012 Posts: 175

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
08-02-2014, 07:35 PM
 johncw82 Junior Member Join Date: May 2014 Location: Hong Kong Posts: 4

#4
08-03-2014, 06:59 AM
 zenobia43 Senior Member Join Date: Mar 2012 Posts: 175

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 guess-and-check)?

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
08-03-2014, 08:05 AM
 johncw82 Junior Member Join Date: May 2014 Location: Hong Kong Posts: 4

Quote:
 Originally Posted by zenobia43 Does the book state somewhere that each solution is unique and each step in the solution only requires logic (no guess-and-check)? 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.
According to the Introduction, it says:

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
08-03-2014, 04:50 PM
 zenobia43 Senior Member Join Date: Mar 2012 Posts: 175

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 - Super-Saver
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 non-uniqueness 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.

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