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Nov 11 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 942
Location: Rimini, Italy
PostPosted: Fri Nov 11, 2022 10:26 am    Post subject: Nov 11 VH Reply with quote
Hi everyone,

Code:

+-------------+---------------+-----------------+
| 4  15  9    | 6    8    17  | 257   3    25   |
| 17 6   378  | 2    5    137 | 478   478  9    |
| 2  35  3578 | 4    9    37  | 5678  1    56   |
+-------------+---------------+-----------------+
| 3  7   26   | 5    124  469 | 12469 469  8    |
| 8  49  1    | 7    24   469 | 3     4569 2456 |
| 5  49  26   | 139  1234 8   | 12469 469  7    |
+-------------+---------------+-----------------+
| 17 8   3457 | 139  6    2   | 4579  4579 345  |
| 6  135 357  | 1389 134  49  | 5789  2    35   |
| 9  2   34   | 38   7    5   | 468   468  1    |
+-------------+---------------+-----------------+

Play this puzzle online at the Daily Sudoku site

Quote:
X-Wing with number 7 in r27c18 and -7 in r2c367,r7c37
AND
W-wing 3,8 in r2c3,r9c4 SL with number 8 in r29c8 and -3 in r9c3
AND
XY-Wing 1,3,7 in r2c16,r3c6 and -7 in r3c3

OR with only 1 step with some AIC

if r2c1=7 -7 in r23c3,r7c1
if r2c1=1 r1c6=1 r1c7=7 r8c3=7 and -7 in r23c3,r7c1

OR

if r2c3=3 -3 in r3c2,r789c3
if r2c3 is not 3 r2c6=3 r2c1=1 r7c1=7 r2c8=7 r1c6=7 r3c6=3 r8c2=3 and -3 in r3c2,r789c3


Ciao Gianni
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TomC



Joined: 30 Oct 2020
Posts: 358
Location: Wales
PostPosted: Fri Nov 11, 2022 1:29 pm    Post subject: Reply with quote
Remove <1> from r2c1 to solve

Code:

+-----------------+-----------------+---------------------+
|  4   m15   9    | 6     8    x17  | e257     3    f25   |
| a17   6    378  | 2     5     137 |  478    d478   9    |
|  2    35   3578 | 4     9     37  |  5678    1     56   |
+-----------------+-----------------+---------------------+
|  3    7    26   | 5     124   469 |  12469   469   8    |
|  8    49   1    | 7     24    469 |  3       4569  2456 |
|  5    49   26   | 139   1234  8   |  12469   469   7    |
+-----------------+-----------------+---------------------+
| b17   8    3457 | 139   6     2   |  4579   c4579  345  |
|  6    135  357  | 1389  134   49  |  5789    2     35   |
|  9    2    34   | 38    7     5   |  468     468   1    |
+-----------------+-----------------+---------------------+


The X-wing on <7> in abcd and the <1>'s in mx produce the contradiction:

If a=1 then d=7, e<>7, x=7
If a=1 then m<>1, x=1
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TomC



Joined: 30 Oct 2020
Posts: 358
Location: Wales
PostPosted: Fri Nov 11, 2022 3:02 pm    Post subject: Reply with quote
Another way to look at this is an Almost Naked Pair in r1c79 (ef)

If r1c79 is a <25> pair then m=1, a=7
If r1c79 is NOT a <25> pair then e=7, d<>7, c=7, b<>7, a=7
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