runforhome wrote:

I used to think that solving "easy" killer sudoku was too easy.

Now I have find a way to make it more difficult and that is not to type any help numbers. Or using pen and paper.

Interesting perspective! I tend to enjoy the ‘easy’ puzzles as it leaves me more time to solve the more challenging ones.

I’ve been on holidays for the last ten days and between travel and other holiday related activities I’ve failed to maintain the 100% year to date record that I had been jealously guarding up until my travels. If a few of the easy puzzles had been even easier, I might not have fallen off the wagon!

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As a plain calcudoku puzzle (where there are no box constraints and values can repeat within cages), it made an excellent puzzle which was quite enjoyable to solve. In this context I think it would make it into the difficult section, but it is still easier than either the harder 9x9 puzzles that we get on a regular basis or the Friday killers..

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veryevilking wrote:

Will you post a new one for points?

Not a bad idea, thanks for the reminder.

About making it worth points: should be possible I think.

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The last two years it has been far easier for me to do KSs than when I first started. For me, lots of practice has made a difference. I know you have done all the books, but for others, solving the two KS books makes a difference in your ability do to the puzzles.

Like you, I sorted out columns on the right hand side.

After eliminating as many possibilities as I could analytically, I noticed that cells C4, D1, and F7 were affected each other, and only had two possibilities. That was where I started with trial & error.

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Not wanting to include spoilers for those who haven’t done it yet, I will say that I managed to sort out a few of the cells in the 3 columns on the right hand side of the puzzle and this gave me the start I needed to work through it.

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pnm wrote:

The Friday Killer Sudoku is supposed to be the most difficult one of the week,

but yes, yesterday's does seem a step up than what is usual on a Friday

I’m surprised to see that it’s already been solved 240 times, which is not that far off the average number of solvers over the previous 4 Fridays. I must have some kind of a blind spot, but hopefully I’ll manage to get my head around it.

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I’d welcome any insights from those of you who’ve solved it. How did you approach the puzzle and how did you get your hooks into it? I find I tend to struggle with Killer sudokus far more than I do with other puzzles and I’m struggling to understand why this is the case. Any insights anyone can provide would be extremely welcome and very much appreciated.

Thanks

Paul

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Rectangles can be 3x3, 3x6, nx9.

Here's a list of useful relations used solving the puzzle:

C1 + C2 + A3 + C3 = 22

D1 + A4 + C4 + D4 = 15

D1 + F1 + E3 + F3 = 20

G1 + I2 + H3 + I3 = 14

F1 + I4 + H4 = 13

A4 + C4 + A6 + C6 = 21

A3 + C3 + D4 + A7 + C7 = 22

G4 + H4 + I4 + G6 + I6 = 24

A7 + C7 + C8 + C9 = 23

A6 + C6 + D8 + D9 = 17

D7 + F7 + D8 + F8 + D9 + F9 = 27

G7 + I7 + G8 = 12

I6 + F8 + F9 = 13

D1 + D4 + A7 + C7 = 13

C5 = 1

D1 + D4 + D8 + D9 = 11

F2 + F3 = 5

I1 + I5 + I8 + I9 = 23

B4 + A5 + B5 + B6 = 23

B4 + A5 + B5 + B6 = 23

F2 + F3 = 5

I1 + I5 + I8 + I9 = 23

G5 + G9 = 15

B2 + D2 + G2 + I2 = 25

B7 + E7 + G7 + H7 = 21

For example C5=1 is based on cols A,B. The cages of this region total 91 and C5 is the only external point.

F2 + F3 = 5 is similarly based on the region consisting of columns A-E.

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