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Jan 2 VH

 
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Earl



Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
PostPosted: Sat Jan 02, 2021 3:20 pm    Post subject: Jan 2 VH Reply with quote
356xywing@R6C2, -3R4C45

Early Earl

PS You guys still hung over from New Years?
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hughwill



Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
PostPosted: Sat Jan 02, 2021 5:32 pm    Post subject: Reply with quote
I make it that the first xy wing takes you to here:

Code:

+--------+-------------+----------+
| 7 1 5  | 4   6    9  | 2  8  3  |
| 9 4 2  | 5   38   38 | 1  7  6  |
| 3 8 6  | 2   7    1  | 59 59 4  |
+--------+-------------+----------+
| 8 2 3  | 6   19   7  | 4  19 5  |
| 5 9 4  | 138 2    38 | 37 6  17 |
| 1 6 7  | 39  4    5  | 39 2  8  |
+--------+-------------+----------+
| 4 5 18 | 7   18   2  | 6  3  9  |
| 2 3 18 | 189 1589 6  | 57 4  17 |
| 6 7 9  | 13  135  4  | 8  15 2  |
+--------+-------------+----------+

Play this puzzle online at the Daily Sudoku site

but you still need one of the two XY wings (139 or 138) on offer to finish it off.

Happy New Year Earl (and all)
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immpy



Joined: 06 May 2017
Posts: 574
PostPosted: Sat Jan 02, 2021 10:15 pm    Post subject: Reply with quote
Like a kid with a new toy, I am still finding fascination with Keith's "interesting boxes". In this instance the candidate (1) appears in four interesting boxes; 5, 6, 8, and 9. These are arranged in a rectangle. After identifying all strong links on (1) it becomes clear that the cells r5c4 and r9c8 will act as pincers on 1, thus making r9c4<>1.

cheers...immp
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immpy



Joined: 06 May 2017
Posts: 574
PostPosted: Mon Jan 04, 2021 5:24 pm    Post subject: Reply with quote
After identifying the rectangular pattern of interesting boxes for a chosen candidate, identify ALL strong links for the chosen candidate, in ALL boxes. Then begin looking for an X-Chain for the chosen candidate using the strong links. The endpoints will be pincers on that candidate.

cheers...immp
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