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  Topic: Jun 02 VH
dongrave

Replies: 1
Views: 154

PostForum: Daily Sudoku puzzles   Posted: Tue Jun 02, 2020 11:53 am   Subject: Jun 02 VH
To solve it using just VH moves (i.e. X Wings, XY Wings, and XYZ Wings) my second step from Gianni's second grid was the 249 XYZ Wing with pivot at r2c4 (-9r1c4) instead of his W Wing.
  Topic: May 29 VH
dongrave

Replies: 0
Views: 158

PostForum: Daily Sudoku puzzles   Posted: Fri May 29, 2020 12:24 pm   Subject: May 29 VH

+-------------+-------------+-----------+
| 139 5 369 | 389 2 7 | 19 4 68 |
| 8 17 79 | 59 4 6 | 3 2 15 |
| 2 4 369 | 3589 1 3589 | 7 59 68 |
+-------------+----------- ...
  Topic: VH+ 050720
dongrave

Replies: 2
Views: 575

PostForum: Other puzzles   Posted: Fri May 08, 2020 5:42 pm   Subject: VH+ 050720
+----------------+-----------+---------------+
| 1 9 26 | 26 4 35 | 78 378 57 |
| 2356 7 8 | 1 56 235 | 26 9 4 |
| 23456 2456 246 | 9 8 7 | 1 236 256 |
+------- ...
  Topic: May 05 VH
dongrave

Replies: 2
Views: 322

PostForum: Daily Sudoku puzzles   Posted: Tue May 05, 2020 11:32 am   Subject: May 05 VH
The standard VH move of 18-5 XY Wing with pivot at r8c4 giving -5r45c5 also solves it.
  Topic: May 3 Medium - Multiple Solutions
dongrave

Replies: 2
Views: 365

PostForum: Daily Sudoku puzzles   Posted: Mon May 04, 2020 11:35 am   Subject: May 3 Medium - Multiple Solutions
Hi blindleadrer, It looks like you accidentally included both 1 and 6 as candidates in r6c9 but the starting grid has a 1 in that cell! Thanks, Don.
  Topic: Apr 30 VH
dongrave

Replies: 5
Views: 466

PostForum: Daily Sudoku puzzles   Posted: Thu Apr 30, 2020 2:02 pm   Subject: Apr 30 VH
Sorry, Gianni, I don't get your logic there at all. I don't understand where the 9 in r2c6 disappears to in between your two steps.

The way I solved it is


+-----------+-------------+---------- ...
  Topic: Wings (rated too hard) 091618
dongrave

Replies: 3
Views: 6915

PostForum: Other puzzles   Posted: Sun Sep 16, 2018 6:11 pm   Subject: Wings (rated too hard) 091618
Hmm, I've used 3 wings so far and it's still not solved! And I doubt that there's a single step solution for this one. Can one of you guys prove me wrong?
  Topic: Helmut's Advanced 2018-08-18
dongrave

Replies: 2
Views: 6312

PostForum: Other puzzles   Posted: Sun Aug 19, 2018 7:22 pm   Subject: Helmut's Advanced 2018-08-18
Ha! Wow, nice solution Clement! What's the 'length' of that chain? 4? Wow, much shorter than my solution! Good one!
  Topic: Challenging 081318
dongrave

Replies: 5
Views: 9493

PostForum: Other puzzles   Posted: Sun Aug 19, 2018 5:37 pm   Subject: Challenging 081318
I enjoyed that one too! I had the same grid after basics as Gianni. Then I used the chain (8-5)r2c1=(5-6)r1c2=r1c7-(6=3)r7c7-(3=8)r9c8-r9c4=r2c4 contradiction => r2c1<>8.
  Topic: Helmut's Advanced 2018-08-18
dongrave

Replies: 2
Views: 6312

PostForum: Other puzzles   Posted: Sun Aug 19, 2018 3:39 pm   Subject: Helmut's Advanced 2018-08-18
Another enjoyable puzzle yesterday on Helmut's site.
+-------+-------+-------+
| 8 . 2 | . 1 . | . . . |
| . 4 . | . . . | 6 . 1 |
| . 7 . | 8 . 4 | . . . |
+-------+-------+-------+
...
  Topic: Is Marty still on this site?
dongrave

Replies: 0
Views: 5084

PostForum: Other puzzles   Posted: Sat Aug 11, 2018 9:33 pm   Subject: Is Marty still on this site?
I haven't heard from Marty in a long time. Does he still come to this site? He helped me a lot and I became a lot more interested in Sudoku puzzles thanks to him! I miss you Marty!
  Topic: A.Sudoku 4/08/2018
dongrave

Replies: 4
Views: 7878

PostForum: Other puzzles   Posted: Mon Aug 06, 2018 8:06 pm   Subject: A.Sudoku 4/08/2018
Oh, of course! Very interesting! I didn't think of that! Thanks!
  Topic: A.Sudoku 4/08/2018
dongrave

Replies: 4
Views: 7878

PostForum: Other puzzles   Posted: Sun Aug 05, 2018 5:35 pm   Subject: A.Sudoku 4/08/2018
Sorry, this one's too tough for me! Here's the grid after basics I think.
+----------------+------------+----------------+
| 1256 1268 1256 | 4 9 3 | 257 1578 2578 |
| 345 48 9 | 1 ...
  Topic: Challenging Puzzle 072518
dongrave

Replies: 6
Views: 9114

PostForum: Other puzzles   Posted: Wed Jul 25, 2018 11:13 pm   Subject: Challenging Puzzle 072518
Thanks immpy! I can't get the puzzle from Helmut's site tonight! (I kept getting an error about 'resource limit exceeded'.) Now I've got one to do.
  Topic: Helmut's Advanced 07/21/18
dongrave

Replies: 3
Views: 7061

PostForum: Other puzzles   Posted: Sun Jul 22, 2018 2:14 pm   Subject: Helmut's Advanced 07/21/18
Wow! Dan's solution sure is a lot shorter than mine! I was all over the map.
+-----------+-------------+-------------+
| 3 8 4 | 25 6 15 | 7 129 259 |
| 29 1 5 | 27 3 79 | 4 ...
  Topic: 21 Jui VH
dongrave

Replies: 3
Views: 6474

PostForum: Daily Sudoku puzzles   Posted: Sat Jul 21, 2018 9:41 pm   Subject: 21 Jui VH
Thanks Clement! Well now we clearly know where Sam's bug lies! He's obviously not exhausting all possible basic moves before also examining advanced moves. You can't do that when you're rating the ...
  Topic: Helmut's Advanced 07/21/18
dongrave

Replies: 3
Views: 7061

PostForum: Other puzzles   Posted: Sat Jul 21, 2018 4:58 pm   Subject: Helmut's Advanced 07/21/18
Today's Helmut Advanced puzzle.
+-------+-------+-------+
| . 8 . | . . . | 7 . . |
| . 1 5 | . 3 . | 4 . . |
| . . . | . . . | . . 3 |
+-------+-------+-------+
| . . . | 1 4 . | 3 8 ...
  Topic: 21 Jui VH
dongrave

Replies: 3
Views: 6474

PostForum: Daily Sudoku puzzles   Posted: Sat Jul 21, 2018 4:50 pm   Subject: 21 Jui VH
I think I solved it with just basics. Unless I screwed up there was a naked 246 in r148c4 to get to the following grid.
+-----------------+--------------+---------------+
| 1248 5 7 | 24 9 ...
  Topic: Helmut's 07/12/18 Advanced
dongrave

Replies: 5
Views: 9409

PostForum: Other puzzles   Posted: Wed Jul 18, 2018 12:57 am   Subject: Helmut's 07/12/18 Advanced
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 ...
  Topic: Helmut's 07/12/18 Advanced
dongrave

Replies: 5
Views: 9409

PostForum: Other puzzles   Posted: Sat Jul 14, 2018 12:25 pm   Subject: Helmut's 07/12/18 Advanced
Grid after basics.

+-------------+-------------+----------------+
| 123 23 12 | 4 67 67 | 9 5 8 |
| 9 4 6 | 1 5 8 | 7 2 3 |
| 8 5 7 | 2 3 9 | 4 ...
 
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