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Wed Jan 25 2017 7 x 7 difficult (Subtraction only) http://www.calcudoku.org/forum/viewtopic.php?f=16&t=865 
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Author:  eclipsegirl [ Wed Jan 25, 2017 1:55 am ] 
Post subject:  Wed Jan 25 2017 7 x 7 difficult (Subtraction only) 
Wed Jan 25 2017 7 x 7. Difficult  Subtraction only This 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 73, 62 or 51. 
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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