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Helmut's 07/12/18 Advanced

 
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dongrave



Joined: 06 Mar 2014
Posts: 563

PostPosted: Thu Jul 12, 2018 11:13 pm    Post subject: Helmut's 07/12/18 Advanced Reply with quote

Another one that was a lot of fun! I used my favorite method again to solve it.
Code:

 +-------+-------+-------+
 | . . . | . . . | . . . |
 | 9 . . | . 5 . | . 2 3 |
 | . . 7 | 2 3 9 | . 1 . |
 +-------+-------+-------+
 | 6 . . | 3 . . | 5 . . |
 | . 1 . | . 9 . | . 6 . |
 | . . 3 | . . 4 | . . 2 |
 +-------+-------+-------+
 | . 6 . | 7 4 5 | 8 . . |
 | 7 8 . | . 1 . | . . 5 |
 | . . . | . . . | . . . |
 +-------+-------+-------+
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ZeroAssoluto



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

PostPosted: Fri Jul 13, 2018 1:00 pm    Post subject: Reply with quote

Hi everyone,

W-Wing 3,9 in r7c8,r9c2 connected by number 9 in r6c28 and -3 in r7c1,r9c8

Ciao Gianni
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dongrave



Joined: 06 Mar 2014
Posts: 563

PostPosted: Sat Jul 14, 2018 12:25 pm    Post subject: Reply with quote

Grid after basics.
Code:

+-------------+-------------+----------------+
| 123 23  12  | 4   67  67  | 9   5    8     |
| 9   4   6   | 1   5   8   | 7   2    3     |
| 8   5   7   | 2   3   9   | 46  1    46    |
+-------------+-------------+----------------+
| 6   279 249 | 3   278 1   | 5   4789 479   |
| 24  1   8   | 5   9   27  | 3   6    47    |
| 5   79  3   | 68  678 4   | 1   789  2     |
+-------------+-------------+----------------+
| 123 6   129 | 7   4   5   | 8   39   19    |
| 7   8   49  | 69  1   236 | 246 349  5     |
| 134 39  5   | 689 268 236 | 246 3479 14679 |
+-------------+-------------+----------------+

(9=4)r8c3-(4=39)r78c8-9r6c8=r6c2=>r9c2<>9!
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immpy



Joined: 06 May 2017
Posts: 570

PostPosted: Wed Jul 18, 2018 12:25 am    Post subject: Reply with quote

Kudos to you dongrave for your chain/loop savvy. I don't even pretend to get a grip on those things...lol. Different strokes for different folks, as they say. Much preferred the W-Wing approach as per Gianni.

cheers...immp
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dongrave



Joined: 06 Mar 2014
Posts: 563

PostPosted: Wed Jul 18, 2018 12:57 am    Post subject: Reply with quote

immpy wrote:
Kudos to you dongrave for your chain/loop savvy. I don't even pretend to get a grip on those things...lol. Different strokes for different folks, as they say. Much preferred the W-Wing approach as per Gianni.

cheers...immp

Ha! Thanks immpy! I know what you mean! You know what? I heard that Keith doesn't use pencil marks! I've thought about asking a doctor to visit him sometime! Smile
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Wed Aug 08, 2018 3:12 pm    Post subject: Reply with quote

I try not to use pencil marks. But I do use them on occasion, especially for VH and Advanced puzzles. It's a way to make easier puzzles a little more challenging.

I start by putting in PMs only for cells that have two candidates. That will find XY-wings, etc.

Since I developed the idea of patterns of cells where useful strong links can lie, I have become quite good at finding skyscrapers and kites with no PMs.

Keith
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