# 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 2-May-2014

## ... by: qoheleth, Viorginia, USA

I have been wondering if there is some way to print out the many strategies as one file out rather than page by page.

Many thanks for the kind words, appreciated. Sorry, the documentation isn’t set up for a global dump/print. I am working on an e-book which will contain the same content (but different examples) and some expanded general Sudoku articles. Will be more on the site when I get nearer the end

## Tuesday 29-Apr-2014

## ... by: PeteTy, Ohio,USA

The big list is more readable with the background shading for the cage groups

It may be helpful to add LOCKED candidates to the big list

or perhaps a short list of cages with locked canditates

eg:

8(3) must have a 1

22(3) must have a 9

12(4) must have 1 and 2

13(4) must have a 1

This helps a great deal on the harder puzzles and is not a very obvious point

## Monday 28-Apr-2014

## ... by: puzzler77, Texas, USA

I discovered a 12 clue X-Sudoku. "Taking Sudoku Seriously" by Jason Rosenhouse & Laura Taalman published by Oxford University Press, Inc. You assured me it would be less than 17 and I believed you! The book may already be a part of your library. Oh, your solver handled quite handily, gave it a rating of 292 (tough).

puzzler77

Thanks for sending it to me!

## Friday 25-Apr-2014

## ... by: Paul, Oklahoma

Paul

http://www.sudokuwiki.org/The_Killer_Cage_Convention

## Thursday 17-Apr-2014

## ... by: Bruce K, Portland, OR

It got to this step:

http://i.imgur.com/EKyYUQb.png

And it just doesn't make sense. A 12-in-4 cage can be 1236 or 1245, but it says "only 1/2/3/4/6 is possible". What happened to 5? 1245 seems perfectly possible in that situation.

Is there something I'm missing here?

Thanks.

As well as considering all the cage combinations the solver prunes the candidates according to those that can fit.

## Tuesday 15-Apr-2014

## ... by: Bernd Mielke, Germany

many thanks for the puzzles! I like the Killer Sudoku most, and I like to select the few strategies which I allow the solver to apply on my behalf.

With the version 1.99 in my (outdated...) Firefox 3.03 deselecting the tough, diabolical and extreme strategies works opposite as in the past: unmarking the group toggles all settings there. The group selector is tickes, and the elements of the group are deselected (or selected when they were before ...). Probably related to the new option with the cookies which I value - it saves me to de-select the same strategies every time.

If possible, I'd like to unselect also the Pointing Pairs and Box/Line Reduction strategies because I want to train my brain to find them by myself ...

Hope this helps to improve the solver further!

Cheers, Bernd..

I can't offer uncheck boxes for point pairs and LBR - this is because some of the later strategies will produce illogical conclusions (sometimes) if candidates haven't been cleared out using the basic strategies. However, if you want to print off a puzzle with the candidates cleared all you need to do is "take step" for just the first few steps.

Hope that helps

## Monday 14-Apr-2014

## ... by: Charles, Spain / UK

## Sunday 13-Apr-2014

## ... by: Meg, Florida

Thanks to you I have a new strategy in my arsenal!! Simple coloring solved the puzzle I was stuck on. And I know there are even more strategies to learn on your site, so THANKS!!

But here's my problem. I solve on my iPad. There's no Sudoku app that I know of that will let me color a cell individually. Your new app isn't for iPad. I'll try the 5 daily puzzles, but I wanted to ask you if you knew of an app that would let me somehow mark a cell. If I'm running just one number, I don't have to mark the little number, just the cell.

After so many years it's great to have a new way to get unstuck!

Meg

True, I would like to see a solver that allows full coloring. I've started that on the website solver but its automatic rather than manual, and only does bi-location links. I am looking at adding something more sophisticated for the SudokuWiki solver app. Its would be very difficult to do for the cell phone version but possible on an Android tablet. Also a good idea to add cell marking. You can currently highlight any sets of numbers of you click on a cell with those numbers in it. But a pallet of numbers you can turn on/off would be nice as well

## Sunday 13-Apr-2014

## ... by: Pat, Indiana

## Friday 28-Feb-2014

## ... by: Cathy, Edmonton, Alberta

Thank You,

Cathy

http://www.sudokuwiki.org/Daily_Jigsaw_Sudoku

?

The 30 day archive has puzzles on Monday which are the easiest.

Also, there is an easy jigsaw on

http://www.sudokuwiki.org/5_Daily_Puzzles_for_the_iPad

every day

## Friday 28-Feb-2014

## ... by: Nat Sothanaphan, Thailand

Load Sudoku: CLICK TO LOADI'm doing a project on Sudoku solver myself and I found your site a very great resource! However I think I found a bug in your program that you should know.

I got this Sudoku from http://norvig.com/sudoku.html. It has no solution. Your solver cannot solve it (or prove that there is no solution), but it deduces a naked pair 5,6 in H5, J5. However, when I plug in both possibilities, it can quickly determine that there is contradiction.

So I stared at the puzzle to see if there is a logical deduction without guessing. And I found it - row 8 actually has no cell with number 1 as a candidate! I think your solver should be able to detect this right away, but you probably missed it because the focus of the solver is not on the "no solution" puzzle. However this should be nice and easy to add :)