sjs34 wrote:
The 9/6 was rated 51.2. Today's is 51.3 and is much easier.
In my opinion the 8x8 medium puzzle from 9/6 that has a rating of 51.3 is much easier than the 6/9 8x8 that had a rating of 51.2.
At first glance it might appear that being all multiplication will make it tricky, but the only solving techniques required to solve it are: Calculating factors for each cage, removing pencil marks for cells in the row and column of a solved cell, and solving a cell because a pencil mark appears only once in a row or column.
I would like to add that I don't say this to be complaining or argumentative. I have found this forum discussion interesting because I have been working on my own way of assessing the difficulty level of puzzles (so far with limited success).