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  Topic: Dec 14 VH
TerenceF

Replies: 5
Views: 19087

PostForum: Daily Sudoku puzzles   Posted: Sun Dec 16, 2018 10:11 am   Subject: Re: Dec 14 VH
Is it a valid move to observe that if r5c4 is 1 then there is no longer a unique solution because there would be a 25 option in r4c25 and r5c25?

Hence r5c4 is 2?



+-----------+-----------+--- ...
  Topic: Dec 16 VH
TerenceF

Replies: 1
Views: 11959

PostForum: Daily Sudoku puzzles   Posted: Sun Dec 16, 2018 9:34 am   Subject: Dec 16 VH
Pretty early on:
XY wing 247 on r1c2, eliminates 7 from r3c4 and r3c5

+-----------------+-----------------+--------------+
| 5 24 467 | 47 9 1467 | 27 3 8 |
| 8 2349 34679 ...
  Topic: Can you spot the next move?
TerenceF

Replies: 4
Views: 21753

PostForum: Other puzzles   Posted: Fri Oct 13, 2017 6:25 am   Subject: Can you spot the next move?
From one of the newspapers a week or so ago

+--------------+-------------+--------------+
| 19 3 59 | 7 6 8 | 4 25 125 |
| 146 8 46 | 2 5 9 | 36 7 136 |
| 7 56 2 ...
  Topic: August 25 VH
TerenceF

Replies: 6
Views: 20455

PostForum: Daily Sudoku puzzles   Posted: Sun Sep 04, 2016 5:15 am   Subject: August 25 VH
It's a Time Zone problem.

The title of the Post does not match the puzzle which is being solved.

The Aug 26 puzzle is a Hard, and can be solved with Basics, per Earl.

The Aug 25 puzzle, on th ...
  Topic: Sep 4 VH
TerenceF

Replies: 2
Views: 12957

PostForum: Daily Sudoku puzzles   Posted: Sun Sep 04, 2016 4:24 am   Subject: Sep 4 VH
It took me multiple steps, but here goes with my answer:

1-2-8 XY-wing pivoted on r9c1 eliminates 1 from r3c4:


+-------------------+---------------+-------------------+
| 7 1269 5 | ...
  Topic: Aug 9 VH
TerenceF

Replies: 9
Views: 26650

PostForum: Daily Sudoku puzzles   Posted: Sun Aug 16, 2015 11:46 am   Subject: Aug 9 VH
Is this an allowable step?

Starting from Hugh's grid, if r3c5 is 4, then we have a chain of cells with 57 as the candidates, viz r1c4,r1c5,r7c5,r7c7,r9c7,r9c4,r1c4 (again) so the puzzle would have ...
  Topic: Jan 15 VH
TerenceF

Replies: 11
Views: 28899

PostForum: Daily Sudoku puzzles   Posted: Thu Jan 15, 2015 2:43 am   Subject: Jan 15 VH
From exactly the same point as Clement there is a 157 XY wing pivoted on r9c6 which eliminates the 5 from r6c4, also making r6c5<>3 leading to the same outcome.
  Topic: Are your grids coming up ok?
TerenceF

Replies: 9
Views: 33726

PostForum: Daily Sudoku puzzles   Posted: Sat Sep 27, 2014 1:18 am   Subject: Are your grids coming up ok?
Another +1 from New Zild
  Topic: The not so good news ...
TerenceF

Replies: 9
Views: 31344

PostForum: Daily Sudoku puzzles   Posted: Sat Sep 27, 2014 1:09 am   Subject: The not so good news ...
As an occasional visitor, but ine who thoroughly enjoys the puzzles, I too would like to offer Marty my best wishes for a speedy recovery
  Topic: Nov 8 VH
TerenceF

Replies: 3
Views: 13727

PostForum: Daily Sudoku puzzles   Posted: Fri Nov 08, 2013 10:05 am   Subject: Nov 8 VH

+---------------+---------------+------------+
| 4 256 3 | 7 258 58 | 1 9 268 |
| 289 29 7 | 6 2389 138 | 4 5 238 |
| 2589 2569 1 | 23 23589 4 | 38 368 7 |
+----- ...
  Topic: Oct 16 VH
TerenceF

Replies: 1
Views: 10640

PostForum: Daily Sudoku puzzles   Posted: Wed Oct 16, 2013 9:52 am   Subject: Oct 16 VH
Fastest puzzle in a while?

The XY wing identified by Hugh is revealed after only one basic move from the starting position:

+----------------+------------------+-----------------+
| 127 8 2 ...
  Topic: May 30 VH
TerenceF

Replies: 4
Views: 15154

PostForum: Daily Sudoku puzzles   Posted: Mon Jun 03, 2013 4:59 am   Subject: May 30 VH
As an alternative, from the same starting point, there is an XY chain starting at r1c9 which eliminates the 5 from r7c9 thus:

If r1c9 = 5 then r7c9<>5 AND
If r1c9 = 4 then r1c3=2 so r9c3=9 s ...
  Topic: Apr 20 VH
TerenceF

Replies: 8
Views: 22472

PostForum: Daily Sudoku puzzles   Posted: Sat Apr 20, 2013 9:39 am   Subject: Apr 20 VH
I think you raise an interesting point, Robert, that one looks to use techniques that match the classification.

I arrived at a similar result starting with simpler techniques.

From Clement's gri ...
  Topic: Mar 22 VH
TerenceF

Replies: 4
Views: 15387

PostForum: Daily Sudoku puzzles   Posted: Wed Apr 03, 2013 8:35 am   Subject: Re: Mar 22 VH

+----------------+------------+-----------+
| 8 149 49 | 5 2 7 | 46 1469 3 |
| 1259 12459 249 | 6 134 #34 | 8 149 7 |
| 7 6 3 | *48 148 9 | 2 14 5 |
+--------------- ...
  Topic: Nov 3 VH
TerenceF

Replies: 1
Views: 10300

PostForum: Daily Sudoku puzzles   Posted: Tue Nov 06, 2012 8:23 am   Subject: Re: Nov 3 VH

+------------+---------+-----------+
| 467 46 9 | 47 8 5 | 1 2 3 |
| 8 2 37 | 37 9 1 | 46 46 5 |
| 1 5 34 | 34 2 6 | 8 7 9 |
+------------+---------+-----------+
| 9 *4 ...
  Topic: Feb 21 VH
TerenceF

Replies: 1
Views: 10686

PostForum: Daily Sudoku puzzles   Posted: Mon Feb 20, 2012 11:24 pm   Subject: Feb 21 VH

+-------------+--------------+-------------+
| 269 4 58 | 3 256 25 | 1 7 89 |
| 679 679 58 | 567 4 1 | 39 389 2 |
| 27 1 3 | 27 8 9 | 4 5 6 |
+------------- ...
  Topic: Feb 17 VH
TerenceF

Replies: 7
Views: 22166

PostForum: Daily Sudoku puzzles   Posted: Fri Feb 17, 2012 8:23 pm   Subject: Re: Feb 17 VH

+----------+-------------+----------+
| 8 2 1 | 5 6 47 | 9 3 47 |
| 7 6 9 | 1 38 34 | 5 2 48 |
| 4 5 3 | 2789 89 279 | 78 1 6 |
+----------+-------------+----------+
| 5 ...
  Topic: Feb 17 VH
TerenceF

Replies: 7
Views: 22166

PostForum: Daily Sudoku puzzles   Posted: Fri Feb 17, 2012 1:34 am   Subject: Feb 17 VH

+----------+-------------+----------+
| 8 2 1 | 5 6 47 | 9 3 47 |
| 7 6 9 | 1 38 34 | 5 2 48 |
| 4 5 3 | 2789 89 279 | 78 1 6 |
+----------+-------------+----------+
| 5 ...
  Topic: Tuesday 14th so called VH
TerenceF

Replies: 1
Views: 10883

PostForum: Daily Sudoku puzzles   Posted: Mon Feb 13, 2012 10:50 pm   Subject: Tuesday 14th so called VH
You are quite right George, whilst going through the basic moves some more complex things (like X-wings on 5 and Cool, but on closer examination these moves are not required, and basic stuff will get yo ...
  Topic: Feb 2 VH
TerenceF

Replies: 13
Views: 37255

PostForum: Daily Sudoku puzzles   Posted: Thu Feb 02, 2012 4:51 am   Subject: Feb 2 VH
Thanks Marty, voice of reason again. Smile

Interesting that the 5 from r1c8 was eliminated by the wing I spotted, and yet you saw a better more basic move that gives the same result.

I like to t ...
 
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