Feedback and Questions

On a recent puzzle, (link) the sudoku solver found an XY-Chain that was described as

-3[B8]+6[B8]-6[G8]+7[G8]-7[J9]+9[J9]-9[E9]+1[E9]-1[H9]+3[H9]

I have no idea how to interpret the + and - notation, and am struggling to find where this is explained anywhere on the wiki.

Just a link to the explanation would be great!

TIA
RedNectar

Importing a plaintext puzzle looks to join numbers in adjacent lines together, resulting in an incomplete set. For example, two rows (newline separators) :

1 2 3 ... 13
2 3 1 ...

will result in 1 2 3 ... 132 3 1 ... i.e. the 13 and 2 are concatenated.

Function import_user_sudoku() in Javascript file sudoku4.js replaces newlines and tabs with empty strings:

dstring=dstring.replaceAll('\t','');
dstring=dstring.replaceAll('\n','');

As generic white space characters, I'd like to suggest replacing them with space characters. This would keep the numbers separated for the parser. Might not hurt to add '\r' to the replacement, as well.

https://www.sudokuwiki.org/js/sudoku4.js?v=2.75

Thank you!

i am not sure about the rules concerning b and bx str8ts, so fe if you have got one black cell in one box , does that mean that either the 1 or the 9 cannot be in the box, or is it possible 1234 and 6789?

best regards

Kai

Thank you for your site - I have had unbelievable joy over years using it.

I might have overlooked it, but does your unique rectangle page have to me one of the most basic use cases? Three bivalue squares xy and one trivalue square xyz, so the trivalue square must be z.

I love unique rectangles, but I think the technique is not respected in some circles, because it is not “pure logic.” Do you have any comments?

Again, tremendous love, gratitude, and respect to you!

Jacques

Der Mr. Stuart,
I've been enjoying 1 to 25 as of late. However, there are several things which I've noticed which I consider rather unfortunate:
-on mobile in portrait mode there isn't realy a way to go to other places on the site (contrary to this domain, where you can use the page Index link to find your way around)
-The Puzzles don't seem to be ordered in order of difficulty. Today, for example, Puzzles 2-4 solved pretty easy for me, while Puzzles 1 is so far unsolved.
-particularely bad together with the previous point and contrary to e.g. the sudoku player, the player for 1-25 doesn't seem to save partial progress so I can always come back later.
Kind regards, a random stranger

Dear Mr. Stuart,
first I want to praise the quality and scope of the Sudokuwiki, really impressing!

I am retired, so I don't have much idle time and I limit my activity to the basic sudoku, not even the very tough, just moderate ones.

I purchase printed brochures with sudoku puzzles, enter them im your solver to print them and solve on the paper. In last several months I had problems with printing the sudoku with given numbers only, instead of printing empty cells blank, solver fills them with all nine candidates, distorting the cells.

To avoid this problem, I start solving the sudoku on-line as far as I can without writing the candidates, then choose the option "Automatically clear" and repeat the last solved candidate to obtain the real remaining candidates and then print the sudoku with them.

Can you help me with this problem? Why empty cells can't be really empty?

Once again, thank you for running this excellent site!

Kind regrds, Boris Halasz, Zagreb, Croatia

Thank you so much for your Killer Sudoku Solver, just helped me after I got stuck for an hour while also teaching me something!

I got stuck on this NYT sudoku so I entered it in your solver. But your solver took some steps and then got stuck looking for naked pairs/triples (it says "wait") and it is no longer possible to take any steps

I love your killer Sudoku solver. I usually make a mistake because of the notes in the small squares I'm working in. I can read the notes because they are clear(better than my handwriting...lol). In general; hands down; this site is best I've worked with.

import a sudoku works once for me if I use paste. when I past another it says only 29 characters entered although there were 81. the first 52 characters in line 1 are ignored. I have tried this in 3 different browsers. same results in all