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"Sam's puzzles ALWAYS have only one solution"!

I was allowing for the possibility of an error when I said 'usually only have one solution". What I should have said is "inten ...

froycard,

A program I use says it only has one solution and Sam's puzzles usually only have one solution. Is it possible you made an error someplace?

...takes only one xy-wing.

Or a W-wing.

Or a UR.

Or a different W-wing.

Alan,

Thus this appears not to be an xyz-wing as I have just learned it.

It's not. It's the combination of two techniques (XYZ-wing & coloring) and has been explained by Keith in his p ...

There was mention on a WXYZ-wing.
Is this the same as the W-wing that is sometimes mentioned by
contributors to this forum?

No. What is mentioned as the W-wing is named in honor of the first ...

Alan,

Your "Triple with a kink" understanding of the XYZ-wing is semi-appropriate (I almost used a reference to a naked/locked triple but decided against it to avoid confusion, for thi ...

Alan,

XYZ 256 R7C5

This is Peter's notation for an XYZ-wing involving (2,5,6) with r7c5 being the 'pivot cell'.

Basically one is looking for two cells that each contain two of those sam ...

malaboman,

Look [url=www.dailysudoku.com/sudoku/forums/viewtopic.php?t=1905&sid=393182f412aaaeafc5cb8b91266a1851]at this post in the 'Site help' forum. It's a sticky that describes how to do ...

In regard to a recent discussion, I thought it might be nice to see if we can generate some data about whether posters are reluctant to post questions about topics that are not as advanced as most dis ...

..whether because they're not out there or because some of the more advanced talk puts them off.

Another possibility is that new posters are much better about trying to find the answers on their ...

Ostrich?

Removal of locked candidates in box 7 reveals naked triple in r8. Singles after that.

Here are two sites that were recently suggested by others:

www.playr.co.uk/sudoku/index.php

www.sudocue.net/daily.php

Basics stop here:

*--------------------------------------------------*
| 369 2 67 | 5 1 379 | 89 4 78 |
| 359 8 47 | 47 6 39 | 1 59 2 |
| 59 45 ...

I resorted to a few XY-chains to solve this one.

Intrigued, I went to the site listed by nataraj to check out some of the other puzzles. In their archive (bad sign: It's listed as a 30 day arch ...

Keith,

Thanks for the clarification.

As the VH's sometimes seem not-so-hard lately, I've been trying to find that one move that turns everything to either naked or hidden singles after doing ...

Come on Keith, don't leave us hangin'. Where's that puzzle?

Observing the 12 candidate pairs in blocks 3, 6 and 9, I noticed that whatever value R9C7 took, R6C9 must be 1. Intuitively, I suspect this is related to Johan's links. But can anyone identify any fur ...

Here's the grid after the opening singles and the box/line interaction on <1> that leads to five more singles.

*-----------------------------------------------------------*
| 145 8 ...