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Nov 08 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 942
Location: Rimini, Italy
PostPosted: Mon Nov 08, 2021 10:12 am    Post subject: Nov 08 VH Reply with quote
Hi everyone,

Code:

+----------+--------------+--------------+
| 35 4 359 | 367  69  367 | 2  1    8    |
| 8  7 39  | 1    49  2   | 5  34   6    |
| 1  2 6   | 35   8   345 | 9  347  347  |
+----------+--------------+--------------+
| 57 1 2   | 568  3   56  | 4  789  79   |
| 4  9 35  | 58   7   1   | 6  38   2    |
| 37 6 8   | 4    2   9   | 37 5    1    |
+----------+--------------+--------------+
| 9  8 4   | 2367 56  367 | 1  27   57   |
| 2  5 17  | 9    14  8   | 37 6    347  |
| 6  3 17  | 27   145 47  | 8  2479 4579 |
+----------+--------------+--------------+

Play this puzzle online at the Daily Sudoku site

XY-Wing 1,4,7 in r8c5,r9c36 and -1 in r8c3,r9c5
or in r8c35,r9c6 and -7 in r9c3

Ciao Gianni
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TomC



Joined: 30 Oct 2020
Posts: 358
Location: Wales
PostPosted: Mon Nov 08, 2021 1:42 pm    Post subject: Reply with quote
Or you could have r8c5 <> 4

As then in row 8 you would get <37> pair, r7c9=5, r7c5=6 leads to two 9's in box 2
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Mogulmeister



Joined: 03 May 2007
Posts: 1151
PostPosted: Mon Nov 08, 2021 8:33 pm    Post subject: Reply with quote
Very cool Tom and the flip side of that one is an ANP 37-347 using the same <37> pair you used above.

IF the NP is FALSE (37=4)r8c79-(4)r8c5 and r8c5 < > 4

-OR-

IF the NP is TRUE (4=37)r8c79-(7=5)r7c9-(5=6)r7c5-(6=9)r1c5-(9=4)r2c5-(4)r8c5 and again r8c5 < > 4

Either way - r8c5 < > 4

Note that when the NP is TRUE as above there are no 4s in row 8
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