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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. I'm also directing Str8ts feedback here. Please feel free to drop me a note on the side of the page. Or you can email me directly at andrew@str8ts.com.

Post a Comment or Question here...

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Any Sudoku you want to publish here for easy loading into the solver - 81 characters, use '.' or '0' for unknowns.

	public - comment/question will be added to feedback column
	private - email comment/question directly to Andrew Stuart, don't display here

Comment, question or feedback:

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letters you see:

If you are writing to alert me of a problem (thank-you!) please include a url to the page in question.
Can get fixes in quicker if I know immediately where to go.

Many thanks to all the people who have helped improve the solvers and strategies with their feedback!

Friday 13-Dec-2024

... by: Wlodek, Germany

Problem until sat two days with notes

Andrew Stuart writes:

Fixed the problem with notes on Str8ts player. Believe it was an issue less than 24 hrs.

Monday 9-Dec-2024

... by: Pablo, Chile

Load Sudoku: CLICK TO LOAD

The solver says that this puzzle is Easy or Moderate depending on the rotation of the board... it should be the same difficulty level regardless of the rotation

Andrew Stuart writes:

Yes this shows the top-left bottom-right bias in the solver. It is also on the boundary - which means small changes might lead to a similar score.

Tuesday 19-Nov-2024

... by: Paul, Canada

Load Sudoku: CLICK TO LOAD

In the partially solved puzzle above the step is a 3D Medusa, producing this output:

3D Medusa

(RULE 5): Uncoloured candidate 2 in E6 can see coloured 2 elsewhere and an oppositely coloured 4 in its own cell. It can be removed.

In the solver the 2 in E6 was coloured not uncoloured. Perhaps, should have coloured the 2 in E5 instead?.

Andrew Stuart writes:

Hard to tell if the 2 in E6 was coloured – you can make a case for it if you trace the chains manually but lets say it was a colour. If it was blue then we’d have two blue numbers in the same cell. A no-no. If it was green we’d have two green candidates in the row. Also a no-no. So it doesn’t really matter. Its about the 4 in E6 and the 2 in G6

Tuesday 19-Nov-2024

... by: Robin Hall, England

Hi, I’ve suddenly encountered a problem I haven’t had before , when pasting in a 81 long string for the importing a Sudoku nothing happens. I have been doing this for a couple of years without any issue but suddenly the import doesn’t work, this is on iOS, I haven’t tried on a widows computer?

Andrew Stuart writes:

I figured out the issues with Import this morning. Missing brackets. 2.28.3, let me know how that goes for you

Monday 18-Nov-2024

... by: Jayalakshmi Vidyashankar, India

hI
The "Import a Sudoku" tab is not functioning at https://www.sudokuwiki.org/Sudoku.htm
Please set it right
thanks
jayaa

Andrew Stuart writes:

I created some bugs in 2.28 but hoping they are gone now. Can you [CRTL]+[F5] in case you need to refresh manually. Does the import problem persist? Working for me this morning