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Sep 25 VH

 
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Earl



Joined: 30 May 2007
Posts: 660
Location: Victoria, KS

PostPosted: Sat Sep 25, 2021 4:28 pm    Post subject: Sep 25 VH Reply with quote

No posts, no VH.

Early Earl
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hughwill



Joined: 05 Apr 2010
Posts: 418
Location: Birmingham UK

PostPosted: Sun Sep 26, 2021 11:14 am    Post subject: 25 Sep 'VH' Reply with quote

Surprised no posts. This one was one of the most complicated VHs I've come across!
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Mogulmeister



Joined: 03 May 2007
Posts: 963

PostPosted: Sun Sep 26, 2021 10:20 pm    Post subject: Reply with quote

Forgive me guys but who would normally post it ?
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peter urhegyi



Joined: 26 Oct 2020
Posts: 14

PostPosted: Mon Sep 27, 2021 7:30 am    Post subject: daily sudoku 25-09-2021 Reply with quote

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.
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Mogulmeister



Joined: 03 May 2007
Posts: 963

PostPosted: Mon Sep 27, 2021 9:04 am    Post subject: Reply with quote

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 . |
+-------+-------+-------+
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Mogulmeister



Joined: 03 May 2007
Posts: 963

PostPosted: Mon Sep 27, 2021 9:16 am    Post subject: Reply with quote

Please layout your solutions 👍
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TomC



Joined: 30 Oct 2020
Posts: 143
Location: Wales

PostPosted: Mon Sep 27, 2021 11:39 am    Post subject: Reply with quote

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
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Mogulmeister



Joined: 03 May 2007
Posts: 963

PostPosted: Tue Sep 28, 2021 4:55 am    Post subject: Reply with quote

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 1ís in r7c78 as mentioned by Tom above. But what if itís 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.
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