Calcudoku puzzle forumhttp://www.calcudoku.org/forum/ Wed Jan 25 2017 7 x 7 difficult (Subtraction only)http://www.calcudoku.org/forum/viewtopic.php?f=16&t=865 Page 1 of 2

 Author: eclipsegirl  [ Wed Jan 25, 2017 1:55 am ] Post subject: Wed Jan 25 2017 7 x 7 difficult (Subtraction only) Wed Jan 25 20177 x 7. Difficult - Subtraction onlyThis puzzle seemed particularly easy for me.I want other's opinions. Maybe I am getting better at this particular type of puzzle or maybe it was just an easier one?Inquiring minds want to know. Thanks for your help

 Author: jaek  [ Wed Jan 25, 2017 7:27 am ] Post subject: Re: Wed Jan 25 2017 7 x 7 difficult (Subtraction only) I hate to say it but I think this was just a particularly easy puzzle.. I finished it much more quickly than normal with distractions in the background to boot.While I find that most weeks I have to work through a couple or a few dependancies to figure out the pair of numbers in a given cell for this puzzle, this week there were several instances where the only available options were much closer to the surface.I think of it as analogous to my best timed puzzle times - sometimes the numbers, and the formulas, just fall into place.

 Author: skeeter84  [ Wed Jan 25, 2017 7:40 am ] Post subject: Re: Wed Jan 25 2017 7 x 7 difficult (Subtraction only) I thought it was on the easier side myself; not that I'm complaining or anything! A four cannot be placed into the 4- cages since you'd need either a 0 or 8 as the complementary number. But neither of those choices exist in this puzzle, so your options are 7-3, 6-2 or 5-1.

 Author: paulv66  [ Wed Jan 25, 2017 7:52 am ] Post subject: Re: Wed Jan 25 2017 7 x 7 difficult (Subtraction only) The subtraction only puzzles can be quite tricky, but this one fell into place relatively quickly. I don't know how long it usually takes me to solve the 7x7 difficult, but today's puzzle took me just over 7 minutes, which is probably less than usual.

 Author: jpoos  [ Wed Jan 25, 2017 4:07 pm ] Post subject: Re: Wed Jan 25 2017 7 x 7 difficult (Subtraction only) Puzzles in certain categories can vary quite a bit. This type of puzzle generally takes me anywhere from 2 to 15 minutes, and todays puzzle indeed took me just over 2 minutes. At least the 10x10 is a bit more on the difficult side of the spectrum in my experience.

 Author: eclipsegirl  [ Wed Jan 25, 2017 4:45 pm ] Post subject: Re: Wed Jan 25 2017 7 x 7 difficult (Subtraction only) Thanks for all of your opinions.I felt the same, that there were reduced possibilities due to use of 4 - cages.I just wanted to know that others felt the same.@jpoos, the 10 x 10 did seem harder than others in the past.

 Author: pnm  [ Wed Jan 25, 2017 4:45 pm ] Post subject: Re: Wed Jan 25 2017 7 x 7 difficult (Subtraction only) jpoos wrote:Puzzles in certain categories can vary quite a bit.I can control the difficulty range a bit, so I could make the "acceptance window" much tighter.At the moment the window for the Killer Sudoku puzzles is pretty tight, for example.

 Author: paulv66  [ Wed Jan 25, 2017 7:20 pm ] Post subject: Re: Wed Jan 25 2017 7 x 7 difficult (Subtraction only) pnm wrote:jpoos wrote:Puzzles in certain categories can vary quite a bit.I can control the difficulty range a bit, so I could make the "acceptance window" much tighter.At the moment the window for the Killer Sudoku puzzles is pretty tight, for example.Variety is the spice of life! I don't see anything wrong with having a bit of variation in the difficulty level from one week to the next. Jpoos, 2 minutes is amazing! Then again, you are super fast at the timed puzzles, so I guess that's only to be expected!

 Author: jaek  [ Wed Jan 25, 2017 7:28 pm ] Post subject: Re: Wed Jan 25 2017 7 x 7 difficult (Subtraction only) paulv66 wrote:Variety is the spice of life!Seconded!

 Author: sjs34  [ Wed Jan 25, 2017 10:25 pm ] Post subject: Re: Wed Jan 25 2017 7 x 7 difficult (Subtraction only) Another voice in favor of variability. But also it would be nice if you could post a pertinent variability window. That is, today's difficulty rating is 65.6. What is the rating window for the 7x7 subtractions in general? Finally, I assume you have fine tuned the difficulty rating to be as reflective of reality as possible. I find that it often is but sometimes isn't. Also, I gather that a difficulty rating for killer sudukos has not been possible.

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