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  Topic: Mar 15 VH
TomC

Replies: 1
Views: 859

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: 1794

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: 1708

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: 3980

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: 2906

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: 2080

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: 5272

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: 3331

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: 2999

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: 3967

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: 6847

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: 6332

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 ...
  Topic: Nov 24 VH
TomC

Replies: 2
Views: 7085

PostForum: Daily Sudoku puzzles   Posted: Sat Nov 25, 2023 9:35 am   Subject: Nov 24 VH
Remove <5> from r1c7, r9c8 to solve

+--------+----------+---------------+
| 2 1 6 | 3 79 4 | x578 d59 78 |
| 9 5 7 | 68 68 1 | 2 3 4 |
| 3 4 8 | 5 79 2 | b17 c19 6 | ...
  Topic: Nov 21 VH
TomC

Replies: 2
Views: 7572

PostForum: Daily Sudoku puzzles   Posted: Wed Nov 22, 2023 8:43 am   Subject: Nov 21 VH
Remove <7> from r8c8 to solve

Whatever the value of r7c7 <348> r8c8 cannot be <7>
  Topic: Nov 14 VH
TomC

Replies: 3
Views: 7814

PostForum: Daily Sudoku puzzles   Posted: Thu Nov 16, 2023 1:10 pm   Subject: Nov 14 VH
Can anyone explain Draw/Play hint of r2c3 = 1 as the solution?

I can see a chain that would give this, but it must be X, XY or XYZ, or not?
  Topic: VH+ 110823
TomC

Replies: 2
Views: 11901

PostForum: Other puzzles   Posted: Thu Nov 09, 2023 3:59 pm   Subject: VH+ 110823
Nice one, Immpy

I used forcing a unique rectangle to solve


+---------------+-------------------+---------------+
| 2 5 178 | 17 4 3 | 168 9 1678 |
| 178 6 1378 | 1579 ...
  Topic: Nov 01 VH
TomC

Replies: 1
Views: 5969

PostForum: Daily Sudoku puzzles   Posted: Wed Nov 01, 2023 1:27 pm   Subject: Re: Nov 01 VH
Remove <8> from r9c9 to solve
If r9c9=8, r9c2=1, r3c2=2, r3c9=3 this would produce a UR <12> in r27c89
  Topic: Oct 30 VH
TomC

Replies: 1
Views: 5919

PostForum: Daily Sudoku puzzles   Posted: Mon Oct 30, 2023 6:23 pm   Subject: Oct 30 VH
Remove <1> from r6c2 to solve

+---------------+---------+---------+
| 3 8 4 | 7 9 2 | 5 6 1 |
| 9 7 56 | 56 4 1 | 8 2 3 |
| 16 156 2 | 3 56 8 | 9 4 7 |
+---- ...
  Topic: Oct 26 VH
TomC

Replies: 1
Views: 7493

PostForum: Daily Sudoku puzzles   Posted: Fri Oct 27, 2023 12:26 pm   Subject: Oct 26 VH
Or you could use the XY chain 17-47-49-19 in r1c1, r2c19, r3c8 to remove <1> from r3c1 and r1c8
  Topic: Oct 15 VH
TomC

Replies: 1
Views: 11423

PostForum: Daily Sudoku puzzles   Posted: Sun Oct 15, 2023 2:51 pm   Subject: Oct 15 VH
r2c1 = <7> to avoid Unique Rectangle <24> in r14c12
 
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