Author |
Message |
Topic: Jul 18 VH |
TomC
Replies: 1
Views: 8825
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Forum: Daily Sudoku puzzles Posted: Sat Jul 20, 2024 11:03 am Subject: Jul 18 VH |
remove <9> from r3c4 to solve
If r3c4=9, <34> pair in row 2 gives r2c2=8, r3c3=9 |
Topic: Jun 19 VH |
TomC
Replies: 1
Views: 12055
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Forum: 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: 15316
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Forum: 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: 15316
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Forum: 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: 3
Views: 27293
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Forum: 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: 16174
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Forum: 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
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Topic: May 14 VH |
TomC
Replies: 3
Views: 21734
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Forum: 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
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Topic: May 14 VH |
TomC
Replies: 3
Views: 21734
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Forum: 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: 18836
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Forum: 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: 18954
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Forum: 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: 27804
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Forum: 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
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Topic: Feb 17 VH |
TomC
Replies: 1
Views: 17014
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Forum: 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: 32082
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Forum: 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: 19337
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Forum: 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: 15672
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Forum: 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: 30540
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Forum: 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: 15160
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Forum: 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: 14324
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Forum: 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: 15173
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Forum: 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: 16348
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Forum: 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 ... |
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