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4/2/13 9x9
http://www.calcudoku.org/forum/viewtopic.php?f=16&t=430
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Author:  pnm  [ Mon Apr 08, 2013 10:51 am ]
Post subject:  Re: 4/2/13 9x9

picklepep wrote:
I just noticed that this puzzle only has a rating of 130. It's a little bit funny as it was the most difficult puzzle I've ever done.


Using the "informal" difficulty rating of nr solved / nr 4x4 easy solved: 48 / 495 = 9.7%, which is not the smallest
such percentage recorded for a Tuesday 9x9 (there was an 8.3% on 24/7/2012 for example), but it's close [scared]

(48 / 495, not 59 / 502, I'm only counting puzzles solved on the day itself)

(as was done for 12x12 puzzles in this thread:
viewtopic.php?f=16&t=419)

There are a few other factors that I'm using to assess the difficulty of a puzzle (the rating number on
the page is derived from a few of them), I want to try to find the one(s) which correlate best with that percentage.

Patrick

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