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Feb 16 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 940
Location: Rimini, Italy
PostPosted: Wed Feb 16, 2022 10:40 am    Post subject: Feb 16 VH Reply with quote
Hi everyone,

Code:

+----------------+--------+-----------+
| 25   578  157  | 9 3 6  | 4   78 12 |
| 6    89   19   | 2 7 4  | 189 5  3  |
| 2349 3479 3479 | 5 1 8  | 79  6  29 |
+----------------+--------+-----------+
| 1    2    59   | 7 8 59 | 6   3  4  |
| 7    59   6    | 3 4 59 | 2   1  8  |
| 34   34   8    | 6 2 1  | 5   9  7  |
+----------------+--------+-----------+
| 345  3457 3457 | 1 9 2  | 38  48 6  |
| 8    1    39   | 4 6 7  | 39  2  5  |
| 49   6    2    | 8 5 3  | 179 47 19 |
+----------------+--------+-----------+

Play this puzzle online at the Daily Sudoku site

Quote:
XYZ-Wing 1,7,9 in r39c7,r9c9 and -9 in r8c7
or
2 String Kite with number 9 in r39c1,r8c37 and -9 in r3c7
or
X-Wing with number 9 in r39c19 and -9 in r3c237,r9c7


Ciao Gianni
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TomC



Joined: 30 Oct 2020
Posts: 358
Location: Wales
PostPosted: Wed Feb 16, 2022 12:58 pm    Post subject: Reply with quote
-1 in r2c7 as then <79> pair in c7, r8c7=3, r8c3=9 and r2c3 is also <1>
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Mogulmeister



Joined: 03 May 2007
Posts: 1151
PostPosted: Thu Feb 17, 2022 12:42 pm    Post subject: Reply with quote
It's the old pirate's favourite - "pincers of eight" at (a) r1c8 and (d) r7c7.

One of these must be true for 8 so r7c8 < > 8.

Code:
+----------------+--------+-----------+
| 25   578  157  | 9 3 6  | 4  a78 12 |
| 6    89   19   | 2 7 4  | 189 5  3  |
| 2349 3479 3479 | 5 1 8  | b79 6  29 |
+----------------+--------+-----------+
| 1    2    59   | 7 8 59 | 6   3  4  |
| 7    59   6    | 3 4 59 | 2   1  8  |
| 34   34   8    | 6 2 1  | 5   9  7  |
+----------------+--------+-----------+
| 345  3457 3457 | 1 9 2  | d38 4-8 6 |
| 8    1    39   | 4 6 7  | c39 2  5  |
| 49   6    2    | 8 5 3  | 179 47 19 |
+----------------+--------+-----------+


Last edited by Mogulmeister on Thu Feb 17, 2022 2:51 pm; edited 1 time in total
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Mogulmeister



Joined: 03 May 2007
Posts: 1151
PostPosted: Thu Feb 17, 2022 1:57 pm    Post subject: Reply with quote
You can also look at position (a) at r1c8 and say what if it is 7 ?

The above chain shows you that if you say a = 7 then d = 8 and r7c8 < > 8

But another route also shows that if a = 7 then r9c8 = 4 and r7c8 DOES = 8.



This contradictory result shows that (a) can never be 7.
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