# Feedback and Questions

I've received a lot of interesting comments and questions from Sudoku fans over the last few years and this page
is where I try to answer them. Please feel free to drop me a note on the side of the page or try the Facebook
comment box. Or you can email me directly at andrew@str8ts.com.
**Post a Comment or Question here...**

## Friday 24-May-2013

## ... by: Robin Thornton, France

I have a problem concerning the Daily Killer for 23/5/2013 and I have spotted an error in your explanation for a step. However firstly I would like to complement you on your marvelous site and thank you for all the pleasure it has given me.

I was stuck in attempting to solve yesterday's Killer so I stepped through your solution and all went exactly according to my own progress until I reached the step in which you said that the 4's could be removed from A4 and A6 on the grounds that the valid combinations for a Cage of value 10 with 3 cells would not allow them. Here you gave the valid numbers adding up to 10 for a Cage of 3 cells in which you included 8 and 9 which are clearly not possible (the error). I cannot reproduce the puzzle so I can only refer to my own paper version. At this point I had possibles :-

A5 1,3,4,5

A6 1,3,4,5

B5 2,4,5,6

As there is no 1 in B5 it would be perfectly possible to have:

A5 1 A5 4

A6 4 or A6 1

B5 5 B5 5

Hence no reason to remove the 4's from A5 and A6?

As your Solver managed to solve the Killer your action must have been correct but for the life of me I cannot understand your reasoning.

Keep up the good work!

Regards,

Robin Thornton

I've also improved the text returned on cage combinations. I also spotted another bug where the last remaining cell in a cage wasn't being returned. A Bit of a howler that as it’s an easy thing to compute and a human would fill it doing it on pen a and pencil. But it is now showing on the solver. The check was in my offline solver which is probably why I didn't spot it before.

Solvers all say version 1.94 now, so refresh a few times if you don’t see that.

## Tuesday 21-May-2013

## ... by: Chris Williams, Fairford, UK

This isn't perfect yet and quite often runs out of ideas, but it's the best out there so well done!

Thanks again,

Chris

Share and enjoy

## Thursday 9-May-2013

## ... by: Amy Hartner, U.S.A.

## Sunday 28-Apr-2013

## ... by: PeteTy, usa

was rather hard took me about 45 min by P&P

killer solver

order of operations

row 1+2

5(2) cage with outie 4 next step...

Solver comment:

Killer Hard Combinations

KILLER COMBO (Hard) on B7: cage of size 2 with clue of 5+ can only be 1/2/4/7/9, removing 3/5/6/8

just kind of wondering what easy combinations are

5(2) cage cant have 56789 which is probably a human ez step

a 2 cage with a 4 in one cell seems sort of obvious to me

also i was unchecking all the normal sudoku boxes i could

and noticed the check box for diabolical and extreme

preforms an xor with all the checked boxes

I assumed it would turn them all on or off

The XOR on the groups of strategies is by design but I can't remember why I did it like that : )

## Thursday 25-Apr-2013

## ... by: Dale E. Kloss, Portland, Oregon, USA

For a Jigsaw puzzle maker, how many unique puzzle shapes could be made?

Note that I'm asking about ONLY puzzle SHAPES not where each number goes.

Thanks. Dale Kloss

## Sunday 14-Apr-2013

## ... by: masonx, usa

## Saturday 13-Apr-2013

## ... by: John, USA

## Friday 5-Apr-2013

## ... by: Geoff, England

There is a Killer Sudoku board I would like you to look at

Click on this link

Thanks for writing in and letting me know!

## Saturday 23-Mar-2013

## ... by: Roman, Australia

I just figured it out this morning. I’d accidentally deleted a couple of lines of code in the last update – to do with the step-by-step solve part. Odd thing is they are so critical I don’t see how it worked when I tested it. Or how it sometimes works and sometimes don’t. Have a go now.

## Friday 22-Mar-2013

## ... by: ejshan, usa

## Thursday 21-Mar-2013

## ... by: Rich Rice, USA