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  Topic: How do YOU use Draw/Play?
alanr555

Replies: 4
Views: 13911

PostForum: General discussion   Posted: Sat Nov 07, 2015 8:32 am   Subject: How do YOU use Draw/Play?
I can go months without using DS at all but recently I cam back to it
when I encountered some published grids that seemed not to be
resolvable (separate topic). Use of D/P enabled me to confirm (in ...
  Topic: Standards in publications
alanr555

Replies: 1
Views: 10967

PostForum: General discussion   Posted: Mon Nov 02, 2015 9:27 pm   Subject: Standards in publications
As a resident in UK, I have been used to published puzzles being able
to be solved using "standard" techniques but recently I have had an
extended stay in Spain and am asking whether the s ...
  Topic: Generating Process
alanr555

Replies: 26
Views: 56806

PostForum: General discussion   Posted: Mon Nov 02, 2015 8:22 pm   Subject: Generating Process
Thank you , Nataraj, for this comprehensive response.
I like the analogy with the carrots. The concept of creating them all
and then deciding which to keep for which purpose was one of my
thoughts ...
  Topic: A Colorful Excel Solver
alanr555

Replies: 2
Views: 13685

PostForum: Solving techniques, and terminology   Posted: Thu Jan 01, 2015 12:43 am   Subject: A Colorful Excel Solver
Last year (2014!) Manny shared that he has had some success in creating
a colourful Excel solver and was hopeful to be able to attach it to his post.

It would appear that he was UN-successful in t ...
  Topic: Generating Process
alanr555

Replies: 26
Views: 56806

PostForum: General discussion   Posted: Wed Dec 10, 2014 3:29 am   Subject: Generating Process
I have been tackling puzzles for nearly ten years now. Throughout that
time I have had admiration for those who CREATE the puzzles.

Is there a forum that explains HOW to generate a puzzle?

Clea ...
  Topic: Fish&wings
alanr555

Replies: 11
Views: 14319

PostForum: Other puzzles   Posted: Mon Dec 31, 2007 4:08 am   Subject: Fish&wings

Your grid has a naked triple/hidden single in column 9.


It looks like a quartet to me with 389/139/389/18.
How does that become a triple+single?
  Topic: Fish&wings
alanr555

Replies: 11
Views: 14319

PostForum: Other puzzles   Posted: Mon Dec 31, 2007 4:02 am   Subject: Fish&wings

x-wing on 3's
then xy-chain
69-89-89-79-67 takes out 6 in r7c7


Using M/Pairs techniques, I have reached the position before
that quoted.

How does the xy-chain work in this case?
I have ...
  Topic: Many Techniques
alanr555

Replies: 7
Views: 9996

PostForum: Other puzzles   Posted: Mon Dec 31, 2007 2:50 am   Subject: Re: Many Techniques

This one is not very difficult, but at the end
you should find (at least) one of each of these to solve it:

1. A BUG+1
2. A W-wing
3. An M-wing
4. About four XY-wings
5. An extended XY ...
  Topic: Dec 30th VH
alanr555

Replies: 25
Views: 34509

PostForum: Daily Sudoku puzzles   Posted: Sun Dec 30, 2007 9:27 am   Subject: Dec 30th VH

The coloring in the grid kills all the red 6's since
6 in r2c5 is red and
6 in r8c5 is red

This is after the x-wings on the 3's and 7's


Thank you for this excellent example/explanation o ...
  Topic: Dec 30th VH
alanr555

Replies: 25
Views: 34509

PostForum: Daily Sudoku puzzles   Posted: Sun Dec 30, 2007 1:56 am   Subject: Dec 30th VH
Mandatory Pairs techniques resolved 25 cells - leaving another
25 to go, of which 21 were bi-value cells.

A W-wing resolved one more cell - after which the grading moved
from VH to Easy.

Along ...
  Topic: dec 28 Hard
alanr555

Replies: 4
Views: 10456

PostForum: Daily Sudoku puzzles   Posted: Sun Dec 30, 2007 12:52 am   Subject: dec 28 Hard

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?

This should perhaps read:
"Sam's puzzles ALWAYS ...
  Topic: Freep Dec 28, 2007
alanr555

Replies: 11
Views: 17373

PostForum: Other puzzles   Posted: Sun Dec 30, 2007 12:16 am   Subject: Freep Dec 28, 2007
After the X-Wing on <1> in C58 that makes six eliminations in R28:


Using Mandatory Pairs techniques, there is no need to resort to
the X-wing in order to reach the position quoted.


Th ...
  Topic: Freep Dec 28, 2007
alanr555

Replies: 11
Views: 17373

PostForum: Other puzzles   Posted: Sun Dec 30, 2007 12:02 am   Subject: Freep Dec 28, 2007

If it is a W-wing, how should I document it?

Document it in what way?

When reference is made in this forum to the technique that has
been used it is usually stated in a concise form.

Com ...
  Topic: Freep Dec 28, 2007
alanr555

Replies: 11
Views: 17373

PostForum: Other puzzles   Posted: Sat Dec 29, 2007 12:28 pm   Subject: Freep Dec 28, 2007
One W-Wing on 14 did it for me.

I do not know what W-wing is referenced here.
However, having just learned about the W-wing I decided to look for
one and discovered that cells r5c2 and r7c3 each ...
  Topic: Freep Dec 28, 2007
alanr555

Replies: 11
Views: 17373

PostForum: Other puzzles   Posted: Sat Dec 29, 2007 12:13 pm   Subject: Freep Dec 28, 2007

There is a useless

I do not understand this comment - but I am only just coming to
grips with the xyz-wing.

Given the trio of cells with 145 as stated, one can eliminate the
common digit (1 ...
  Topic: Dec 27th VH
alanr555

Replies: 25
Views: 42085

PostForum: Daily Sudoku puzzles   Posted: Sat Dec 29, 2007 3:29 am   Subject: Dec 27th VH

What is mentioned as the W-wing is named in honor of the first person from this forum who mentioned the pattern. It had been discussed on other forums earlier and named differently.


Thank you ...
  Topic: Dec 27th VH
alanr555

Replies: 25
Views: 42085

PostForum: Daily Sudoku puzzles   Posted: Sat Dec 29, 2007 3:00 am   Subject: Dec 27th VH
Alan,
What's wrong with "When a cell XYZ sees both an XZ and YZ cell, no cell seeing all three of XYZ-XZ-YZ can contain Z."?


Probably nothing but some of us have difficulty with algebr ...
  Topic: Dec 27th VH
alanr555

Replies: 25
Views: 42085

PostForum: Daily Sudoku puzzles   Posted: Fri Dec 28, 2007 11:57 am   Subject: Dec 27th VH

Not proposing to send people to other sites, but ...


There is such a thing as "brand loyalty"!!
I would hope that members of this forum can bring ideas from
elsewhere and contribu ...
  Topic: Dec 27th VH
alanr555

Replies: 25
Views: 42085

PostForum: Daily Sudoku puzzles   Posted: Fri Dec 28, 2007 11:13 am   Subject: Dec 27th VH

The only exclusion possible for an XYZ-wing is the digit all three cells have in common and there can be only one digit they have in common.


Thank you for clarifying this for me.
The quote abo ...
  Topic: Dec 27th VH
alanr555

Replies: 25
Views: 42085

PostForum: Daily Sudoku puzzles   Posted: Fri Dec 28, 2007 12:36 am   Subject: Dec 27th VH
I include in "non-advanced" techniques such things as............"type one" unique rectangles (ie same pair in all four corners).


I'm pretty sure that if you have the same pai ...
 
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