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Helmut's Advanced # 1799728531

 
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dongrave



Joined: 06 Mar 2014
Posts: 377

PostPosted: Fri Jun 22, 2018 2:43 pm    Post subject: Helmut's Advanced # 1799728531 Reply with quote

I really enjoyed finding a one-step solution for this one.
I'm glad Keith told me about Helmut's site.
I enjoy doing his Very Hard/Advanced every day.
Code:

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



Joined: 24 Apr 2006
Posts: 1027
Location: Dar es Salaam Tanzania

PostPosted: Tue Jun 26, 2018 12:13 pm    Post subject: Helmult's Advanced # 179928531 Reply with quote

Code:

+------------------------+----------------+----------------------+
| 6        1        7    | 8      9     3 | 5       4        2   |
| 25       25       3    | 7      6     4 | 89      89       1   |
| 48       48       9    | 5      2     1 | 6       7        3   |
+------------------------+----------------+----------------------+
| 1258     9        1258 | 3      4     7 | 18      158      6   |
| 458      7        458  | 6      1     9 | 3       2        458 |
| 3        6       a14   | 2      5     8 | b149    19       7   |
+------------------------+----------------+----------------------+
| 7        345      45-1 | 9      8     6 | 2       135      45  |
| 9        248     f1248 |e14     3     5 | 7       6        48  |
| 1458     3458     6    |d14     7     2 | c148    1358     9   |
+------------------------+----------------+----------------------+

(1=4)r6c3 - r6c7 = r9c7 - r9c4 = (4-1)r8c4 = (1)r8c3 => -1 r7c3; stte
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dongrave



Joined: 06 Mar 2014
Posts: 377

PostPosted: Tue Jun 26, 2018 10:16 pm    Post subject: Reply with quote

Wow, very nice Clement! Much better than my solution! Thanks!
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Clement



Joined: 24 Apr 2006
Posts: 1027
Location: Dar es Salaam Tanzania

PostPosted: Wed Jun 27, 2018 12:29 pm    Post subject: Reply with quote

dongrave wrote:
Wow, very nice Clement! Much better than my solution! Thanks!
O.K. Thanks
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immpy



Joined: 06 May 2017
Posts: 339

PostPosted: Wed Jun 27, 2018 8:35 pm    Post subject: Reply with quote

Kudos to the 1-steppers. I wasn't able to achieve solvation that way, but after using an XY-Wing 1-89 I arrived here:
Code:

+----------------+--------+-------------+
| 6    1    7    | 8  9 3 | 5   4   2   |
| 25   25   3    | 7  6 4 | 9   8   1   |
| 48   48   9    | 5  2 1 | 6   7   3   |
+----------------+--------+-------------+
| 1258 9    1258 | 3  4 7 | 18  15  6   |
| 458  7    458  | 6  1 9 | 3   2   458 |
| 3    6    14   | 2  5 8 | 14  9   7   |
+----------------+--------+-------------+
| 7    345  145  | 9  8 6 | 2   135 45  |
| 9    248  1248 | 14 3 5 | 7   6   48  |
| 1458 3458 6    | 14 7 2 | 148 135 9   |
+----------------+--------+-------------+

Play this puzzle online at the Daily Sudoku site

I then located a Skyscraper (1) r67c78 resulting in r4c8<>1(=5!) and r9c7<>1.
That took me to the end...thanks for posting the puzzle.

cheers...immp (love those strong links)
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keith



Joined: 19 Sep 2005
Posts: 3344
Location: near Detroit, Michigan, USA

PostPosted: Sat Jun 30, 2018 3:12 pm    Post subject: Reply with quote

Helmut (screen name: Nataraj) was a frequent visitor to this site in the days when we were documenting things like W- and M-wings.

His puzzles are, may I say, more "interesting" than the one-shot XY-wings you often find here.

Do try his "Sudoku Helper". It's quite an interesting tool. First, it will do basics with one click. Also, it will list all possible moves (of the strategies that it knows) for you to select from, if you so wish.

Somewhere on his site he lists the strategies that might be used for each level of difficulty. But, he has lectured me often that he does not have a desired solution path for any puzzle.

One unique thing he does is a "useless" XY-wing with a strong link. That is where the XY-wing has no eliminations, but you can extend one of the pincers with a strong link. It's a very effective tool to know.

Keith
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dongrave



Joined: 06 Mar 2014
Posts: 377

PostPosted: Sun Jul 01, 2018 8:56 pm    Post subject: Reply with quote

Thanks Keith! I'll check it out. I'm a dinosaur though. I still do the puzzles with pencil and paper and unlike you, I have to make pencil marks or I'd never get them solved! Smile (I even use the eraser when I have to!)
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