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  Topic: Jun 19 VH
TomC

Replies: 1
Views: 208

PostForum: Daily Sudoku puzzles   Posted: Thu Jun 20, 2024 8:48 am   Subject: Jun 19 VH
Look for a deadly pattern to solve this one


There is a 45-56-46 triple in rows 7 and 9

If r7c6 = <56> then the puzzle is invalid as it would have two solutions

So r7c6 = <8> to ...
  Topic: Jun 04 VH
TomC

Replies: 2
Views: 2192

PostForum: Daily Sudoku puzzles   Posted: Tue Jun 04, 2024 5:52 pm   Subject: Jun 04 VH
Gianni

Both your grids are the same!
  Topic: Jun 04 VH
TomC

Replies: 2
Views: 2192

PostForum: Daily Sudoku puzzles   Posted: Tue Jun 04, 2024 11:28 am   Subject: Not too hard
In one step from the first grid, r2c2=7 to solve

If r2c2=2, r9c13=2 leads to no <2> in column 7
  Topic: A June Swoon VH++ 060224
TomC

Replies: 2
Views: 3044

PostForum: Other puzzles   Posted: Mon Jun 03, 2024 8:09 am   Subject: A June Swoon VH++ 060224
Remove <4> from r6c7 to solve

+-------------------+--------------+---------------+
| 6 7 2 | 3 5 49 | f49 1 8 |
| 9 34 34 | 1 8 6 | 7 5 2 | ...
  Topic: May 23 VH
TomC

Replies: 1
Views: 3737

PostForum: Daily Sudoku puzzles   Posted: Fri May 24, 2024 2:16 pm   Subject: another way
Another example of forcing a UR - remove <6> from r1c3 to solve

If r1c3=6, r3c3=1, r2c1=2, r7c1=5

Leads to a <12> UR in r17c78
  Topic: May 14 VH
TomC

Replies: 3
Views: 6206

PostForum: Daily Sudoku puzzles   Posted: Tue May 14, 2024 10:23 am   Subject: May 14 VH
For something a bit more fancy remove <1> from r5c8 to solve
If r5c8=1, r5c3=3, r3c3=4, r8c3=6

Leads to a <35> UR in r78c17
  Topic: May 14 VH
TomC

Replies: 3
Views: 6206

PostForum: Daily Sudoku puzzles   Posted: Tue May 14, 2024 10:09 am   Subject: May 14 VH
Thanks Gianni

But doesn't a XY wing solve this in one move? No fancy stuff!

I know draw/play says its not easy after this XY wing but it is!
  Topic: May 12 VH
TomC

Replies: 2
Views: 5196

PostForum: Daily Sudoku puzzles   Posted: Sun May 12, 2024 9:13 am   Subject: May 12 VH
Gianni,

Can you revert to hiding the solutions?

It is not good to have a link to play the puzzle when the solutions are in plain sight below

Grazie
  Topic: Mar 15 VH
TomC

Replies: 1
Views: 7936

PostForum: Daily Sudoku puzzles   Posted: Fri Mar 15, 2024 1:23 pm   Subject: Mar 15 VH
I thought I saw a <129> XY wing in abc, not so, but still helped me remove <2> from r7c5 or r9c9 to solve

+--------+------------+------------+
| 3 8 6 | 2 19 4 | 5 179 179 |
| 2 ...
  Topic: Mar 07 VH
TomC

Replies: 2
Views: 14812

PostForum: Daily Sudoku puzzles   Posted: Thu Mar 07, 2024 10:19 am   Subject: Mar 07 VH
r3c1 = <9> to solve
Look at the <78> pairs in boxes 4 and 6

If r3c1 = <78> the puzzle would have two solutions
  Topic: Feb 17 VH
TomC

Replies: 1
Views: 8626

PostForum: Daily Sudoku puzzles   Posted: Sat Feb 17, 2024 11:48 am   Subject: Feb 17 VH
Daily Sudoku puzzles
The Daily Sudoku puzzles: Discussion, help with the logic, and creative solutions

For a creative solution:

r4c6 = <5> to solve

If r4c6 = <18> you would have ...
  Topic: VH+ 012724
TomC

Replies: 3
Views: 14135

PostForum: Other puzzles   Posted: Sun Jan 28, 2024 11:59 am   Subject: VH+ 012724
Remove <8> from r9c7 to solve

+--------------+----------------+----------------+
| 1 6 2 | 458 58 3 | 7 9 458 |
| 45 7 3 | 4568 9 56 | 1 2 458 |
| 459 ...
  Topic: Jan 26 VH
TomC

Replies: 2
Views: 10595

PostForum: Daily Sudoku puzzles   Posted: Fri Jan 26, 2024 1:19 pm   Subject: Jan 26 VH
<17> W wing in r1c1, r4c2 removes <7> in r3c2 or r6c1, otherwise box 7 no <1>'s
or
<17> W wing in r1c1, r4c2 removes <7> in r3c2 or r6c1, otherwise column 3 no <1> ...
  Topic: Jan 18 VH
TomC

Replies: 1
Views: 9138

PostForum: Daily Sudoku puzzles   Posted: Fri Jan 19, 2024 4:41 pm   Subject: Jan 18 VH
There is a pattern of <78> in rows 4, 5 and 6 which means that r4c9 can't be <78> so must be <5>

Has this pattern got a name?
  Topic: VH+(+) 010624
TomC

Replies: 2
Views: 14625

PostForum: Other puzzles   Posted: Sun Jan 07, 2024 10:15 am   Subject: VH+(+) 010624
Remove <5> from r5c7 to solve

+---------------+-----------+----------------+
| 469 7 2 | 5 3 69 | 8 14 16 |
| 3 1689 168 | 4 689 7 | c29 5 26 |
| 5 4689 468 | ...
  Topic: Dec 30 VH
TomC

Replies: 1
Views: 10276

PostForum: Daily Sudoku puzzles   Posted: Sat Dec 30, 2023 6:49 pm   Subject: Dec 30 VH
Remove <2> from r6c4 to solve
A short chain leads to a contradiction

If r6c4=2, r6c6=6, r4c6=5, r4c1=7 then no <7>'s in box 5
  Topic: Dec 26 VH
TomC

Replies: 1
Views: 9781

PostForum: Daily Sudoku puzzles   Posted: Tue Dec 26, 2023 6:59 pm   Subject: Dec 26 VH
There is an XY chain 57-79-69-56 in boxes 8 and 9 to remove <5> from r7c5 to solve

Look out for a XY wing 79-1 in there too! (Doesn't solve it in one though)
  Topic: Dec 22 VH
TomC

Replies: 1
Views: 10786

PostForum: Daily Sudoku puzzles   Posted: Fri Dec 22, 2023 1:44 pm   Subject: Another way to solve
Remove <3> from r1c4 or r8c5 to solve

+-------------+-----------------+---------------+
| 4 68 2 | a39 b38 5 | 1 3689 7 |
| 1 7 3 | 6 248 29 | 489 489 5 |
...
  Topic: Nov 29 VH
TomC

Replies: 1
Views: 12920

PostForum: Daily Sudoku puzzles   Posted: Wed Nov 29, 2023 1:32 pm   Subject: Nov 29 VH
r8c4 = 2 to solve or r7c7 = 4 to solve

Look at r357c45

If r8c4 = 9 (or r7c7 = 9) then you would have three pairs <24> <45> <25> in r357c45 which would give the puzzle two solut ...
  Topic: Nov 27 VH
TomC

Replies: 1
Views: 12429

PostForum: Daily Sudoku puzzles   Posted: Tue Nov 28, 2023 9:38 am   Subject: Nov 27 VH
Remove <5> from r4c6, r9c8 to solve


+------------+--------------+-------------+
| 18 7 3 | 9 5 18 | 2 6 4 |
| 5 2 4 | 3 67 b68 | 9 c78 1 |
| 9 168 68 | 2 ...
 
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