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paulv66 wrote:

It was definitely quite tricky. I managed to fill in or have pencil marks in columns G to I, but it was difficult to get a hook into the other 6 columns. I decided to run with one of two options for a particular cell and luckily, this proved to be the correct option and I managed to complete it on Friday.

But I note that it has only been solved 138 times, compared to an average of over 280 times for the preceding four weeks. So it definitely caused a lot of people a lot of problems.

Exactly Paul. Columns G to I were filled at first. Then... almost no clues!

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But I note that it has only been solved 138 times, compared to an average of over 280 times for the preceding four weeks. So it definitely caused a lot of people a lot of problems.

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At a certain point, no strategy at all and a lot of possible paths in front of me, so many to discourage trial and error attempts...

Did anybody feel my own impression?

Usually, I trust a lot in the difficulty rate, but this time it wasn't so high (147.1), nevertheless the solving has been very tough...

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(at https://www.amazon.com/gp/product/1517766028)

For some reason the book description was missing from the page, for example (!)

I also updated the cover image (darker background, different font, higher contrast)

I'm looking to add endorsements for this one too (similar to the one that's now on the BBE page,

i.e. "I love these puzzles, they keep my brain alert, which helps a lot when teaching math!", J. Bloemhof, high school math teacher),

so if anyone is up for this, let me know

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Friday's difficult Killer sudoku rated 183.1

The puzzle shown above rated 15.8

Based on my method that makes this puzzle look very easy, as I had said before. I thought it might be of some interest to compare it to a difficult puzzle.

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The puzzle above rated 15.8,

the easy killer (19/10) rated 12.2,

and the medium killer (19/10) rated 49.5

On my ratings scale 15.8 and 12.2 indicates a reasonably easy puzzle, with no complications, and very little analysis required to find the solution.

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-Ville

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- are the easy Killer Sudoku puzzles on the site actually easy?

- how would you rate the puzzle below?

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michaele wrote:

then eliminate 3 [from d1] by using your total of 15 for the 4 "outie" cells and the total of 11 for cells d1,d4,d8,d9 (step(B)).

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bram wrote:

(D) In the

After your step (D) you wanted to find the cell that has 9 in the upper left 3x3 area. We can find that by using your total of 15 for cells a4,c4,d1,d4. First we can find that d1=5: eliminate 1 and 2 from d1 by referring to cages e1 and f1, and cell f3, then eliminate 3 by using your total of 15 for the 4 "outie" cells and the total of 11 for cells d1,d4,d8,d9 (step(B)). Still using the total of 15 we can now solve c3=5, then a4=5 and that gives us a3=9. From this point the puzzle is getting close to being solved.

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