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  Topic: APR 28 VH
gindaani

Replies: 6
Views: 25136

PostForum: Daily Sudoku puzzles   Posted: Mon Apr 29, 2013 4:32 pm   Subject: APR 28 VH
Skyscraper on 4 in rows 2 and 9 is all that is necessary.
  Topic: Scanning vs Cross Hatching
gindaani

Replies: 1
Views: 40468

PostForum: Solving techniques, and terminology   Posted: Thu Apr 04, 2013 4:15 pm   Subject: Scanning vs Cross Hatching
I was looking at the basic techniques on the Sudopedia mirror to put names to the techniques I use. I don't really understand how Scanning is different from Cross Hatching. There seems to be an imp ...
  Topic: June 21 VH
gindaani

Replies: 17
Views: 56967

PostForum: Daily Sudoku puzzles   Posted: Mon Jun 21, 2010 9:48 pm   Subject: June 21 VH
Interesting how the definition of "Very Hard" evolves.
The wife and I were discussing the same thing.
And, I hope, you were talking about Sudoku Laughing

ROFL!! Laughing
  Topic: June 21 VH
gindaani

Replies: 17
Views: 56967

PostForum: Daily Sudoku puzzles   Posted: Mon Jun 21, 2010 7:54 pm   Subject: June 21 VH
I agree completely. On the average, I find hard puzzles more difficult than very hard puzzles. The VH puzzles involve more advanced techniques, but those techniques are generally easy to spot once ...
  Topic: June 21 VH
gindaani

Replies: 17
Views: 56967

PostForum: Daily Sudoku puzzles   Posted: Mon Jun 21, 2010 4:04 pm   Subject: June 21 VH
After the 248 xy wing, there is a naked quad and the puzzle unravels easily after that.

Here is the puzzle after basics.


+-------------------+--------------+---------------+
| 1245 13489 124 ...
  Topic: June 21 VH
gindaani

Replies: 17
Views: 56967

PostForum: Daily Sudoku puzzles   Posted: Mon Jun 21, 2010 3:53 pm   Subject: June 21 VH
248 xy wing did it for me.
  Topic: Feb 16 VH
gindaani

Replies: 12
Views: 37617

PostForum: Daily Sudoku puzzles   Posted: Thu Feb 18, 2010 9:02 pm   Subject: Feb 16 VH
I too like to avoid uniqueness based solutions.

The 679 xy-wing is actually two steps, 1) 7 x-wing 2) 679 xy-wing.

The 367 xy-wing is a one stepper that avoids uniqueness tests.
  Topic: Jan 25 VH
gindaani

Replies: 27
Views: 69944

PostForum: Daily Sudoku puzzles   Posted: Sun Jan 24, 2010 11:14 pm   Subject: Jan 25 VH
23-5 xy wing is another one stepper, though it unravels slower than typical after the xy-wing.

Edit: That was for the Jan 23 puzzle. The Jan 25 puzzle wasn't even available when I posted this.
  Topic: Puzzle 10/01/20 (C)
gindaani

Replies: 6
Views: 20144

PostForum: Puzzles by daj   Posted: Fri Jan 22, 2010 11:21 pm   Subject: Puzzle 10/01/20 (C)
I don't see the 39 UR. After the basics, I had:


+--------+-------------+-------------+
| 5 8 9 | 4 36 1 | 7 36 2 |
| 3 7 4 | 69 2 5 | 69 8 1 |
| 6 2 1 | 39 8 7 | 5 ...
  Topic: Numbers Not in Box
gindaani

Replies: 2
Views: 44119

PostForum: Site help   Posted: Fri Jan 22, 2010 7:55 pm   Subject: Numbers Not in Box
I checked today, and the numbers are back in their boxes. *shrug*
  Topic: Numbers Not in Box
gindaani

Replies: 2
Views: 44119

PostForum: Site help   Posted: Wed Jan 20, 2010 5:55 pm   Subject: Numbers Not in Box
Starting today, the numbers in the play online grid don't fit in the boxes. The big numbers are clipped off at the bottom and the pencil marks bleed into the next box (see below). Any idea what is c ...
  Topic: Nov 14 VH
gindaani

Replies: 4
Views: 17926

PostForum: Daily Sudoku puzzles   Posted: Fri Nov 13, 2009 10:57 pm   Subject: Nov 14 VH
That's odd. I'm still seeing the Nov 13 puzzle as the most recent puzzle.
  Topic: Nov 5 VH
gindaani

Replies: 5
Views: 19803

PostForum: Daily Sudoku puzzles   Posted: Fri Nov 06, 2009 4:19 pm   Subject: Nov 5 VH
If you really want to use xy wings, it takes 3:

-169 xy-wing (or 16-9 xy-wing)
2-69 xy-wing
-489 xy-wing
  Topic: Sept 19 VH
gindaani

Replies: 7
Views: 25489

PostForum: Daily Sudoku puzzles   Posted: Sat Sep 19, 2009 10:02 pm   Subject: Sept 19 VH
158 xyz-wing solves it in one step.
  Topic: Sept 8 VH
gindaani

Replies: 9
Views: 32304

PostForum: Daily Sudoku puzzles   Posted: Wed Sep 09, 2009 10:13 pm   Subject: Sept 8 VH
I would call that a pincer transport since the 8 was transported, but my definition of a pincer transport is more liberal than others. You could also call it pincer coloring.

You could also use t ...
  Topic: 16-Apr-08 VH
gindaani

Replies: 22
Views: 63767

PostForum: Daily Sudoku puzzles   Posted: Tue Jul 21, 2009 8:09 pm   Subject: 16-Apr-08 VH
You made a mistake somewhere prior to your picture. Some of your numbers conflict with the solution to the Apr 16 2008 puzzle.

PS If you use the "Play Online" button on this site, you ...
  Topic: Found!
gindaani

Replies: 2
Views: 27222

PostForum: General discussion   Posted: Tue Jul 21, 2009 7:20 pm   Subject: Found!
It does not appear that you can add "pencil marks." Without pencil marks, hard puzzles would be nearly impossible.
  Topic: Puzzle VH_060
gindaani

Replies: 1
Views: 11849

PostForum: Puzzles by daj   Posted: Fri Jul 17, 2009 9:00 pm   Subject: Puzzle VH_060
257 xy-wing
finned x-wing (6)
  Topic: July 14 VH
gindaani

Replies: 9
Views: 26972

PostForum: Daily Sudoku puzzles   Posted: Tue Jul 14, 2009 3:56 pm   Subject: July 14 VH
For something different there is a:Bug+2 than says r5c8<>8

I do not see how the Bug+2 can eliminate 8 from r5c8. If I understand Bugs correctly, the Bug+2 says that r6c3=4 or r7c2=8. From ...
  Topic: Puzzle VH_057
gindaani

Replies: 3
Views: 15658

PostForum: Puzzles by daj   Posted: Mon Jul 13, 2009 9:21 pm   Subject: Puzzle VH_057
After the basics, I had:

+---------------+-------+----------------+
| 1 457 45 | 9 2 8 | 47 6 3 |
| 479 8 49 | 5 3 6 | 1 247 247 |
| 23 23 6 | 1 7 4 | 9 58 58 ...
 
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