| View previous topic :: View next topic |
| Author |
Message |
dongrave
Joined: 06 Mar 2014
Posts: 568
|
 Posted: Fri Jun 22, 2018 2:43 pm Post subject: Helmut's Advanced # 1799728531 |
 |
|
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 | . . . | . . . |
+-------+-------+-------+
|
|
|
| Back to top |
|
 |
Clement
Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
|
| Posted: Tue Jun 26, 2018 12:13 pm Post subject: Helmult's Advanced # 179928531 |
|
|
| 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 |
|
| Back to top |
|
|
dongrave
Joined: 06 Mar 2014
Posts: 568
|
| Posted: Tue Jun 26, 2018 10:16 pm Post subject: |
|
|
| Wow, very nice Clement! Much better than my solution! Thanks! |
|
| Back to top |
|
|
Clement
Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
|
| Posted: Wed Jun 27, 2018 12:29 pm Post subject: |
|
|
| dongrave wrote: | | Wow, very nice Clement! Much better than my solution! Thanks! |
O.K. Thanks |
|
| Back to top |
|
|
immpy
Joined: 06 May 2017
Posts: 571
|
| Posted: Wed Jun 27, 2018 8:35 pm Post subject: |
|
|
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) |
|
| Back to top |
|
|
keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
|
| Posted: Sat Jun 30, 2018 3:12 pm Post subject: |
|
|
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 |
|
| Back to top |
|
|
dongrave
Joined: 06 Mar 2014
Posts: 568
|
| Posted: Sun Jul 01, 2018 8:56 pm Post subject: |
|
|
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!  (I even use the eraser when I have to!) |
|
| Back to top |
|
|
|
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
