dailysudoku.com

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 ...

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 ...

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 ...

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 ...

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 ...

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?

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...