| View previous topic :: View next topic |
| Author |
Message |
Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
|
 Posted: Sat Sep 25, 2021 4:28 pm Post subject: Sep 25 VH |
 |
|
No posts, no VH.
Early Earl |
|
| Back to top |
|
 |
hughwill
Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
|
| Posted: Sun Sep 26, 2021 11:14 am Post subject: 25 Sep 'VH' |
|
|
| Surprised no posts. This one was one of the most complicated VHs I've come across! |
|
| Back to top |
|
|
Mogulmeister
Joined: 03 May 2007
Posts: 1151
|
| Posted: Sun Sep 26, 2021 10:20 pm Post subject: |
|
|
| Forgive me guys but who would normally post it ? |
|
| Back to top |
|
|
peter urhegyi
Joined: 26 Oct 2020
Posts: 28
|
| Posted: Mon Sep 27, 2021 7:30 am Post subject: daily sudoku 25-09-2021 |
|
|
I found 3 xy-wings to start(2 of them are needed).
After this an x-wing and an xyz-wing eliminating 2 candidates from R2C6 leads to a triple in row 2 and further solves with basics. |
|
| Back to top |
|
|
Mogulmeister
Joined: 03 May 2007
Posts: 1151
|
| Posted: Mon Sep 27, 2021 9:04 am Post subject: |
|
|
| Code: |
+-------+-------+-------+
| . 9 . | 7 6 . | 2 . 3 |
| . . . | . 3 . | 8 . . |
| . . . | . 8 . | . 4 6 |
+-------+-------+-------+
| 6 . 2 | . . 1 | . 3 . |
| . 7 . | . . . | . 8 . |
| . 1 . | 3 . . | 6 . 9 |
+-------+-------+-------+
| 4 6 . | . 2 . | . . . |
| . . 9 | . 4 . | . . . |
| 2 . 7 | . 1 8 | . 6 . |
+-------+-------+-------+
|
|
|
| Back to top |
|
|
Mogulmeister
Joined: 03 May 2007
Posts: 1151
|
| Posted: Mon Sep 27, 2021 9:16 am Post subject: |
|
|
| Please layout your solutions 👍 |
|
| Back to top |
|
|
TomC
Joined: 30 Oct 2020
Posts: 358
Location: Wales
|
| Posted: Mon Sep 27, 2021 11:39 am Post subject: |
|
|
| Code: |
+-------------+------------+-----------------+
| 158 9 48 | 7 6 45 | 2 15 3 |
| 157 245 6 | 124 3 2459 | 8 1579 157 |
| 1357 235 15 | 12 8 259 | 1579 4 6 |
+-------------+------------+-----------------+
| 6 45 2 | 8 9 1 | 457 3 457 |
| 9 7 3 | 24 5 6 | 14 8 124 |
| 58 1 48 | 3 7 24 | 6 25 9 |
+-------------+------------+-----------------+
| 4 6 15 | 59 2 37 | 13579 1579 8 |
| 135 8 9 | 6 4 37 | 1357 1257 1257 |
| 2 35 7 | 59 1 8 | 3459 6 45 |
+-------------+------------+-----------------+
|
Play this puzzle online at the Daily Sudoku site
There are two XY wings I can see here
245 which removes the 5 in r1c8 and
124 which removes the 1 in r3c7
also the 3 cells that make up the second XY form a chain which gives -1 r7c7
so this leads to -1 r7c78 and solves the puzzle |
|
| Back to top |
|
|
Mogulmeister
Joined: 03 May 2007
Posts: 1151
|
| Posted: Tue Sep 28, 2021 4:55 am Post subject: |
|
|
One way of viewing this double elimination of 1's is to look at the <15> at r7c3. This is the anchor or jumping off point.
If it is 1 we have the double elimination of 1’s in r7c78 as mentioned by Tom above. But what if it’s 5 ?
Think of it like a river that splits into two tributaries.
One tributary puts a 1 in r5c7 so that r7c7 <> 1
Second tributary puts a 1 in r1c8 so that r7c8 <>1
Whether r7c3 is 1 or 5 the 1's in r7c78 are toast.
You would still need the 245 XY wing removing 5 in r1c8 afterwards to solve the puzzle. |
|
| Back to top |
|
|
|
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
