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Oct 25 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 868
Location: Rimini, Italy

PostPosted: Sun Oct 25, 2020 10:14 am    Post subject: Oct 25 VH Reply with quote

Hi everyone,

Code:

+-----------+----------+---------+
| 58  7   6 | 58  2 4  | 9 3 1   |
| 4   9   2 | 7   3 1  | 5 6 8   |
| 358 38  1 | 568 9 68 | 7 2 4   |
+-----------+----------+---------+
| 2   1   5 | 3   8 7  | 6 4 9   |
| 9   6   3 | 4   1 5  | 2 8 7   |
| 7   4   8 | 9   6 2  | 3 1 5   |
+-----------+----------+---------+
| 38  238 7 | 1   5 36 | 4 9 236 |
| 1   23  4 | 26  7 9  | 8 5 236 |
| 6   5   9 | 28  4 38 | 1 7 23  |
+-----------+----------+---------+

Play this puzzle online at the Daily Sudoku site

Quote:
W-Wing 2,3 in r8c2,r9c9 SL with number 2 in r7c29 and -3 in r8c9
or
XY-Wing 2,3,6 in r7c6,r8c24 and -3 in r7c12


Ciao Gianni
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storm_norm22



Joined: 24 Oct 2020
Posts: 15

PostPosted: Sun Oct 25, 2020 11:15 pm    Post subject: Reply with quote

Code:
+-----------------+-----------------+-----------+
| (58)    7     6 | (58)    2  4    | 9  3  1   |
| 4       9     2 | 7       3  1    | 5  6  8   |
| 3(5-8)  3(8)  1 | 6(5-8)  9  6(8) | 7  2  4   |
+-----------------+-----------------+-----------+
| 2       1     5 | 3       8  7    | 6  4  9   |
| 9       6     3 | 4       1  5    | 2  8  7   |
| 7       4     8 | 9       6  2    | 3  1  5   |
+-----------------+-----------------+-----------+
| 38      238   7 | 1       5  36   | 4  9  236 |
| 1       23    4 | 26      7  9    | 8  5  236 |
| 6       5     9 | 28      4  38   | 1  7  23  |
+-----------------+-----------------+-----------+


this doesn't solve it.
if you are looking to touch up on your UR practice, notice the UR (58)r13c14
because the 5's are locked in those cells you can safely remove the 8's from r3c14
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storm_norm22



Joined: 24 Oct 2020
Posts: 15

PostPosted: Sun Oct 25, 2020 11:30 pm    Post subject: Reply with quote

Code:
+----------------+---------------+-----------+
| 58    7      6 | 58    2  4    | 9  3  1   |
| 4     9      2 | 7     3  1    | 5  6  8   |
| 358   38     1 | 568   9  68   | 7  2  4   |
+----------------+---------------+-----------+
| 2     1      5 | 3     8  7    | 6  4  9   |
| 9     6      3 | 4     1  5    | 2  8  7   |
| 7     4      8 | 9     6  2    | 3  1  5   |
+----------------+---------------+-----------+
| (38)  (238)  7 | 1     5  (36) | 4  9  236 |
| 1     3-2    4 | (26)  7  9    | 8  5  236 |
| 6     5      9 | 28    4  38   | 1  7  23  |
+----------------+---------------+-----------+



the elusive WXYZ wing extended that solves it.
Quote:
(2=38)r7c12 - (3=6)r7c6 - (6=2)r8c4; r8c2 <> 2
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immpy



Joined: 06 May 2017
Posts: 570

PostPosted: Mon Oct 26, 2020 3:40 pm    Post subject: Reply with quote

Nice solving techniques everyone.

immp
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TomC



Joined: 30 Oct 2020
Posts: 349
Location: Wales

PostPosted: Fri Oct 30, 2020 6:58 pm    Post subject: Reply with quote

My solution was to eliminate 2 from R7C9 because that would result in

either box 7 not having any 2s
or row 7 not having any 6s

Tom
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dongrave



Joined: 06 Mar 2014
Posts: 563

PostPosted: Sat Oct 31, 2020 1:34 pm    Post subject: Reply with quote

TomC wrote:
My solution was to eliminate 2 from R7C9 because that would result in

either box 7 not having any 2s
or row 7 not having any 6s

Tom

Hi Tom, I didn't see your solution right away - but with a little bit of searching I found what I think you're talking about.
2r7c9 - (2=3|8)r7c12 - (3=6)r7c6 - (6=2)r8c4 - 2r8c2
or 2r7c9 - (2=3|8)r7c12 - (3=2)r8c2 - (2=6)r8c4 - 6r7c6.
Thanks, Don.
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TomC



Joined: 30 Oct 2020
Posts: 349
Location: Wales

PostPosted: Sat Oct 31, 2020 3:34 pm    Post subject: Reply with quote

Thanks, Don

I have trouble with notation but think I've understood it.

There is a third way of looking at it by not involving c12

2r7c9 gives r9c9 = 3 and r8c9 = 6 and then r8c4 = 2 so no 2s in box 7

Tom
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immpy



Joined: 06 May 2017
Posts: 570

PostPosted: Sat Oct 31, 2020 3:58 pm    Post subject: Reply with quote

Love those WXYZ-Wings.
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