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  Topic: dec 28 Hard
TKiel

Replies: 4
Views: 11474

PostForum: Daily Sudoku puzzles   Posted: Sun Dec 30, 2007 12:34 pm   Subject: dec 28 Hard
"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 ...
  Topic: dec 28 Hard
TKiel

Replies: 4
Views: 11474

PostForum: Daily Sudoku puzzles   Posted: Sat Dec 29, 2007 6:11 pm   Subject: dec 28 Hard
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?
  Topic: Dec 29 DB
TKiel

Replies: 2
Views: 6071

PostForum: Other puzzles   Posted: Sat Dec 29, 2007 4:20 pm   Subject: Dec 29 DB
...takes only one xy-wing.

Or a W-wing.

Or a UR.

Or a different W-wing.
  Topic: Freep Dec 28, 2007
TKiel

Replies: 11
Views: 19092

PostForum: Other puzzles   Posted: Sat Dec 29, 2007 3:13 pm   Subject: Freep Dec 28, 2007
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 ...
  Topic: Dec 27th VH
TKiel

Replies: 25
Views: 45398

PostForum: Daily Sudoku puzzles   Posted: Fri Dec 28, 2007 2:03 pm   Subject: Dec 27th VH
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 ...
  Topic: Dec 27th VH
TKiel

Replies: 25
Views: 45398

PostForum: Daily Sudoku puzzles   Posted: Fri Dec 28, 2007 6:26 am   Subject: Dec 27th VH
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 ...
  Topic: Dec 27th VH
TKiel

Replies: 25
Views: 45398

PostForum: Daily Sudoku puzzles   Posted: Thu Dec 27, 2007 5:59 pm   Subject: Dec 27th VH
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 ...
  Topic: Discussion level discouraging less advanced topics?
TKiel

Replies: 6
Views: 20726

PostForum: General discussion   Posted: Thu Dec 27, 2007 2:34 pm   Subject: Discussion level discouraging less advanced topics?
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 ...
  Topic: Discussion level discouraging less advanced topics?
TKiel

Replies: 6
Views: 20726

PostForum: General discussion   Posted: Tue Dec 25, 2007 2:41 pm   Subject: Discussion level discouraging less advanced topics?
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 ...
  Topic: Forum Topics
TKiel

Replies: 31
Views: 74245

PostForum: General discussion   Posted: Sun Dec 23, 2007 7:46 pm   Subject: Forum Topics
..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 ...
  Topic: recommended: today's nightmare
TKiel

Replies: 8
Views: 10691

PostForum: Other puzzles   Posted: Fri Dec 14, 2007 12:32 am   Subject: recommended: today's nightmare
Ostrich?
  Topic: Radio times 18/20
TKiel

Replies: 1
Views: 5333

PostForum: Other puzzles   Posted: Sat Nov 24, 2007 11:49 pm   Subject: Radio times 18/20
Removal of locked candidates in box 7 reveals naked triple in r8. Singles after that.
  Topic: Harder puzzles
TKiel

Replies: 2
Views: 14475

PostForum: General discussion   Posted: Sun Oct 21, 2007 1:03 pm   Subject: Harder puzzles
Here are two sites that were recently suggested by others:

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

www.sudocue.net/daily.php
  Topic: Oct 20 DB
TKiel

Replies: 8
Views: 11538

PostForum: Other puzzles   Posted: Sat Oct 20, 2007 1:14 pm   Subject: Oct 20 DB
Basics stop here:


*--------------------------------------------------*
| 369 2 67 | 5 1 379 | 89 4 78 |
| 359 8 47 | 47 6 39 | 1 59 2 |
| 59 45 ...
  Topic: Conceptis Puzzles?
TKiel

Replies: 13
Views: 18524

PostForum: Other puzzles   Posted: Wed Oct 17, 2007 12:38 am   Subject: Conceptis Puzzles?
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 ...
  Topic: Oct 13 vh
TKiel

Replies: 12
Views: 19787

PostForum: Daily Sudoku puzzles   Posted: Sun Oct 14, 2007 8:50 pm   Subject: Oct 13 vh
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 ...
  Topic: Conceptis Puzzles?
TKiel

Replies: 13
Views: 18524

PostForum: Other puzzles   Posted: Sun Oct 14, 2007 8:21 pm   Subject: Conceptis Puzzles?
Come on Keith, don't leave us hangin'. Where's that puzzle?
  Topic: Oct 10 VH
TKiel

Replies: 22
Views: 33769

PostForum: Daily Sudoku puzzles   Posted: Sun Oct 14, 2007 7:51 pm   Subject: Oct 10 VH
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 ...
  Topic: Oct 13 vh
TKiel

Replies: 12
Views: 19787

PostForum: Daily Sudoku puzzles   Posted: Sun Oct 14, 2007 6:43 pm   Subject: Oct 13 vh
Question
  Topic: Oct 13 vh
TKiel

Replies: 12
Views: 19787

PostForum: Daily Sudoku puzzles   Posted: Sun Oct 14, 2007 12:37 pm   Subject: Oct 13 vh
Here's the grid after the opening singles and the box/line interaction on <1> that leads to five more singles.


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