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Author Message
Topic: Almost Locked Sets
David Bryant

Replies: 1
Views: 5920

Forum: Solving Guide & Glossary   Posted: Mon Oct 02, 2006 5:10 pm   Subject: Almost Locked Sets
I'm still trying to understand the "XZ rule" thoroughly.
An almost locked set consists of N cells with exactly N+1 candidates.
So I was working the "nightmare" puzzle for Monday, ...
Topic: A "zen" sudoku
David Bryant

Replies: 0
Views: 3568

Forum: Puzzles   Posted: Sat Sep 23, 2006 1:34 am   Subject: A "zen" sudoku
6.2.5....
.....4.3.
.........
43...8...
.1....2..
......7..
5..27....
.......81
...6.....
This is from Gordon Royle's collection of 17-clue sudoku puzzles. When I run SudoCue (v1.5.1.3) on it ...
David Bryant

Replies: 10
Views: 5886

Forum: Daily Sudoku Nightmare & Archive   Posted: Sat Sep 16, 2006 10:19 pm   Subject: Guess if you want to
... I shalt not guess numbers anymore.
Hi again, Tomi!

There's nothing "wrong" with guessing numbers. Any time you have reduced the number of possibilities in a single cell to two you ca ...
David Bryant

Replies: 10
Views: 5886

Forum: Daily Sudoku Nightmare & Archive   Posted: Fri Sep 15, 2006 10:31 pm   Subject: Maybe we can reconstruct it ...
Hello again, Tomi!

I looked at your picture, but couldn't really make much sense out of it. So I thought I'd take a slightly different tack. I started the puzzle from the beginning and applied all ...
David Bryant

Replies: 10
Views: 5886

Forum: Daily Sudoku Nightmare & Archive   Posted: Fri Sep 15, 2006 12:15 pm   Subject: Try some of these
Hello, Tomi.

Try [url=http://www.sudocue.net/forum/viewtopic.php?t=205]this one, and [url=http://www.sudocue.net/forum/viewtopic.php?t=52]this one. After you've whizzed through those two, you might ...
Topic: Coloured Chains
David Bryant

Replies: 3
Views: 6950

Forum: Solving Techniques & Tips   Posted: Tue Sep 12, 2006 10:44 pm   Subject: Same deduction, different track
Hi, Ron!

I used to talk to Laura a lot on this forum, but she sort of disappeared about last April, or May. Maybe she'll be back when winter rolls around in Sweden again.

I never tried to us ...
Topic: Sept 4 Nightmare
David Bryant

Replies: 4
Views: 3581

Forum: Daily Sudoku Nightmare & Archive   Posted: Mon Sep 11, 2006 12:47 am   Subject: "Double-Implication Chains"
Hi, Ron!

I'm probably not careful enough with my terminology. I think of a double-implication chain as being one of two things.

A. A set of two chains of inference that can be drawn by consideri ...
Topic: Mystery theme week
David Bryant

Replies: 2
Views: 2702

Forum: Daily Sudoku Nightmare & Archive   Posted: Thu Sep 07, 2006 3:26 pm   Subject: Mystery theme week
If you know what the theme for the week
At this point I'm still just guessing, but I'd say it's either short range Nishio or double-implication chains (aka "Empty Rectangles" and "XY ...
Topic: Sept 4 Nightmare
David Bryant

Replies: 4
Views: 3581

Forum: Daily Sudoku Nightmare & Archive   Posted: Wed Sep 06, 2006 2:24 am   Subject: A "DIC" solution
Hi, Ron!

I had a lot of fun with the "ALS" week. I'm still trying to understand how to spot the useful "ALS"s in a puzzle. I was able to solve all seven of the puzzles by using ...
Topic: 27 Jan 2006 Nightmare
David Bryant

Replies: 5
Views: 16961

Forum: Solving Techniques & Tips   Posted: Thu Aug 17, 2006 10:45 pm   Subject: Astute observation
That's an astute observation, Ron. I'm not too good with names for some of these newer "techniques" -- I tend to rely on logic & first principles. Thanks for pointing out that this is an ...
David Bryant

Replies: 0
Views: 3519

Forum: Puzzles   Posted: Mon Aug 14, 2006 9:40 pm   Subject: Another "pearl" of a puzzle
Hi, all!

Since Ruud is posting "pearls" on the nightmare page this week, it seems like a good time to introduce another "pearl" from my friend Andrei's collection.
*---------- ...
David Bryant

Replies: 2
Views: 3130

Forum: Daily Sudoku Nightmare & Archive   Posted: Sun Aug 13, 2006 4:41 pm   Subject: Here's a "forcing chain" solution
Hi, Pepi!

Here's another way to solve the puzzle from the position Ruud posted.
.---------------.---------------.---------------.
| 1249 12 6 | 7 1489 1249| 35 48 35 |
| 49* 8 5 ...
David Bryant

Replies: 1
Views: 3053

Forum: Daily Sudoku Nightmare & Archive   Posted: Wed Jul 26, 2006 12:54 am   Subject: July 25 Nightmare
Hi, Ruud! I really enjoyed today's puzzle, so I thought I would comment on it.

I know you said that SudoCue doesn't employ double-implication chains. But I think it does use a couple of special typ ...
David Bryant

Replies: 2
Views: 2909

Forum: Daily Sudoku Nightmare & Archive   Posted: Tue Jul 18, 2006 12:04 am   Subject: July 17 -- is this a fish?
After doing the more or less usual stuff I arrived at this position.
35 45 9 2 47+ 6 37- 1 8
34 7 18 19 5 148 39 6 2
28 126 1268 179 ...
Topic: Where are the BUGs?
David Bryant

Replies: 3
Views: 3192

Forum: Daily Sudoku Nightmare & Archive   Posted: Fri Jul 14, 2006 4:07 pm   Subject: Relying on "uniquity"
Thanks for the explanation, Ruud.

I went back through some of the earlier puzzles and managed to work a couple of those down to a BUG + 1 pattern by relying heavily on the "uniqueness" of ...

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