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user created puzzles
http://www.calcudoku.org/forum/viewtopic.php?f=2&t=967
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Author:  paulv66  [ Sun Oct 08, 2017 9:22 pm ]
Post subject:  Re: user created puzzles

wjm wrote:
Thank you, michaele, for your 9x9 subtraction only puzzle - it was indeed challenging and I enjoyed working it immensely! I would be interested to know how you, as a puzzle creator, go about proving that your puzzle has a unique solution.

wjm


I also found it very interesting and extremely challenging. Thank you Michaele.

Author:  sjs34  [ Sun Oct 08, 2017 11:57 pm ]
Post subject:  Re: user created puzzles

michaele,

Very impressive, very difficult 9x9 subtraction. Excellent contribution. Congratulations.

Author:  michaele  [ Mon Oct 09, 2017 4:22 am ]
Post subject:  Re: user created puzzles

Good to know you found my latest puzzle a challenge. I have another puzzle ready that I will submit next month.

To answer the question by wjm about ensuring that my puzzles have a unique solution: I start with a pattern of cages, and then try to solve the puzzle, when I have gone as far as possible I can then see where small changes need to be made to make it solvable. The tricky part is to make changes that do not make it too easy to solve. I have assumed (without being completely sure) that if I can solve it without using any guessing or trial and error that there must be only one possible solution. I only use the computer to create the initial pattern of numbers and to save my solving attempts so that I don't have to start from the beginning each time I make a small change to the cage pattern. By the time I finish creating the puzzle I find it is not easy to assess how difficult it is to solve, but on my last 9x9 subtraction puzzle I could tell it was going to be a challenge (it was easier to create the puzzle than to solve it).

I have started creating a 15x15 puzzle with several embedded smaller puzzles, but I have been away for about a week and I have not had the time to finish it.

Author:  wjm  [ Mon Oct 09, 2017 5:15 pm ]
Post subject:  Re: user created puzzles

Thank you for your reply michaele (and also for your comments marblevolcano). I asked because I think I have a good idea for a puzzle theme. I haven't created it yet (probably would be a 9x9), but it would be embarrassing to submit only to find out that it had more than one solution and I didn't realize it. So, my question should really be: How does one submit a puzzle? I imagine that Patrick must review it first and assess for a variety of qualities, maybe including a computer program that tests for a single solution (Patrick?). I apologize if this subject has already been covered in the forum.

wjm

Author:  pnm  [ Mon Oct 09, 2017 8:09 pm ]
Post subject:  Re: user created puzzles

wjm wrote:
I imagine that Patrick must review it first and assess for a variety of qualities, maybe including a computer program that tests for a single solution (Patrick?). I apologize if this subject has already been covered in the forum.


No problem. Yes, I run it through the solver first, to see if it has a single solution,
and to get an estimate of the difficulty level.

If there's a problem with the puzzle, of course I won't put it online, but you'll get an email from me [namaste]

Author:  wjm  [ Tue Oct 10, 2017 12:29 am ]
Post subject:  Re: user created puzzles

Thanks, Patrick! [namaste]

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