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  Topic: Nov 25 VH
dongrave

Replies: 2
Views: 366

PostForum: Daily Sudoku puzzles   Posted: Mon Nov 28, 2022 2:25 pm   Subject: Nov 25 VH
I used a swordfish to remove 5 from r1c4

If anyone out there sees the swordfish on 5's that glesco is referring to, would you point out to me which 3 rows or columns it's in? I looked for a long t ...
  Topic: VH+ 111522
dongrave

Replies: 6
Views: 1404

PostForum: Other puzzles   Posted: Sun Nov 20, 2022 5:28 pm   Subject: Re: VH+ 111522
Oh! Of course! Regardless of whether 7 is True or False in r4c6, it is False in r5c6! Thanks for the clarification Clement!
  Topic: VH+ 111522
dongrave

Replies: 6
Views: 1404

PostForum: Other puzzles   Posted: Sat Nov 19, 2022 9:57 pm   Subject: Re: VH+ 111522

(7=1825)r4c6523 - (5)r7c3 = (5-4)r7c6 = (4)r5c6 => - 7r5c6; stte

Hi Clement! Could you explain the logic behind your chain to me? I know that I'm missing something. I can see that if r4c6 i ...
  Topic: VH+ 111522
dongrave

Replies: 6
Views: 1404

PostForum: Other puzzles   Posted: Wed Nov 16, 2022 4:59 pm   Subject: VH+ 111522
My solution was similar to Tom's:
+--------------+----------------+-------------+
| 2 5 78 | 1 4 6 | 79 3 789 |
| 9 6 1 | 3 7 8 | 4 5 2 |
| 47 48 3 | 5 ...
  Topic: VH+ 110222
dongrave

Replies: 3
Views: 1427

PostForum: Other puzzles   Posted: Thu Nov 03, 2022 2:16 pm   Subject: VH+ 110222
After basics:
+--------------+---------------+---------------+
| 39 4 12 | 5 19 8 | 6 23 7 |
| 39 5 12 | 6 4 7 | 8 23 19 |
| 78 78 6 | 3 19 2 | 1 ...
  Topic: Oct 31 VH
dongrave

Replies: 4
Views: 1357

PostForum: Daily Sudoku puzzles   Posted: Tue Nov 01, 2022 9:09 pm   Subject: Oct 31 VH
Hi Gianni! When you said 'classical steps' I thought that you were referring to just VH moves because many years ago Marty told me that every VH puzzle on this site could be solved by using just the ...
  Topic: Oct 31 VH
dongrave

Replies: 4
Views: 1357

PostForum: Daily Sudoku puzzles   Posted: Mon Oct 31, 2022 1:35 pm   Subject: Oct 31 VH
I used the 269 XYZ-Wing r3c56,r7c5 (-6r1c5) which opened up the 69-1 XY-Wing r1c4,r39c6 (-1r1c6, -1r9c4).
  Topic: Oct 28 VH
dongrave

Replies: 1
Views: 999

PostForum: Daily Sudoku puzzles   Posted: Fri Oct 28, 2022 2:34 pm   Subject: Oct 28 VH
For these incorrectly rated puzzles I always try to find the VH move that the computer must have seen without first exhausting all the basics. This one is really interesting! The only thing that I c ...
  Topic: Oct 22 VH
dongrave

Replies: 3
Views: 1334

PostForum: Daily Sudoku puzzles   Posted: Wed Oct 26, 2022 2:28 pm   Subject: Re: Oct 22 VH
I need more help with this one. I don't see why you can eliminate the 4 in R3C3.
Tom's solution goes as follows:

If r3c3 is 4 then it's not 8 so r6c3 is 8, so r6c6 is not 8 so it's 9, so r4c4 is ...
  Topic: VH+ 102522
dongrave

Replies: 1
Views: 1315

PostForum: Other puzzles   Posted: Wed Oct 26, 2022 2:01 pm   Subject: VH+ 102522
After basics:
+---------------+-----------------+-----------------+
| 3 6 1 | 4 78 9 | 2 78 5 |
| 49 489 2 | 1678 5 168 | 3 478 4678 |
| 7 5 a48 | b6 ...
  Topic: VH+ 101722
dongrave

Replies: 5
Views: 2377

PostForum: Other puzzles   Posted: Wed Oct 19, 2022 8:17 pm   Subject: VH+ 101722
My solution was the same as Tom's.

+--------------+--------------+----------------+
| 3 8 49 | 6 2 19 | 145 145 7 |
| 6 7 1 | 45 45 8 | 2 9 3 |
| 49 2 5 ...
  Topic: VH+ 101122
dongrave

Replies: 2
Views: 2126

PostForum: Other puzzles   Posted: Wed Oct 19, 2022 12:57 pm   Subject: VH+ 101122
I had a real tough time with this one immp! If r2c2=9, I finally found a brutally long chain that lead to 2 6's in box 5 and then if r4c8=8, I found a much shorter chain that lead to 2 9's in column ...
  Topic: VH+ 100822
dongrave

Replies: 14
Views: 4398

PostForum: Other puzzles   Posted: Wed Oct 12, 2022 1:03 am   Subject: VH+ 100822
dongrave,

Unfortunately I have thrown away my paper & pen sheet on this puzzle. Recalling best I can from reviewing your grid, I suspect I used a skyscraper on 2s from columns 3&4 which gi ...
  Topic: VH+ 100822
dongrave

Replies: 14
Views: 4398

PostForum: Other puzzles   Posted: Mon Oct 10, 2022 8:52 pm   Subject: VH+ 100822
Very interesting puzzle! Thanks immp for posting it and thanks everyone for your input!
  Topic: VH+ 100822
dongrave

Replies: 14
Views: 4398

PostForum: Other puzzles   Posted: Mon Oct 10, 2022 2:59 pm   Subject: VH+ 100822
dongrave,

I used an x-wing on columns 2&9 to eliminate 2s in r5c1 & other cells. Then (9=1)r5c1 - (1=2)r5c2 - (2=3)r5c9 - (3=9)r4c8 --> -9r4c1.

Oh, I see! I was unable to solve the ...
  Topic: VH+ 100822
dongrave

Replies: 14
Views: 4398

PostForum: Other puzzles   Posted: Mon Oct 10, 2022 2:34 am   Subject: VH+ 100822
Ah! Good eye Pat! You could simply represent it as a chain that leads to a contradiction: 9r4c1 - (9=3)r4c8 - (3=2)r5c9 - (2=1)r5c2 - (12=9)r5c1 contradiction => r4c1 <> 9 BUT! - I don't t ...
  Topic: VH+ 100822
dongrave

Replies: 14
Views: 4398

PostForum: Other puzzles   Posted: Mon Oct 10, 2022 12:04 am   Subject: VH+ 100822
Could you be more specific glesco? I don't see the xy chain that you're describing. I'll go enter the grid that I ended up with after basics and then I'll update this post to include it.

(Update: ...
  Topic: VH+ 092722
dongrave

Replies: 3
Views: 2938

PostForum: Other puzzles   Posted: Fri Oct 07, 2022 4:41 pm   Subject: VH+ 092722
Wow! Nice job Clement! I used the following ridiculously long chain!

+--------------------+------------------+-----------+
| g45*9 h245 249 | c24 1 6 | 3 8 7 |
| n47*8 a2*48 ...
  Topic: Oct 02 VH
dongrave

Replies: 4
Views: 1640

PostForum: Daily Sudoku puzzles   Posted: Sun Oct 02, 2022 1:20 pm   Subject: Oct 02 VH
I used the X-Wing of 5's in rows 1 and 7 (see Gianni's grid) and that opened up a couple of 356 XY-Wings which solves it.
  Topic: VH+ 092722
dongrave

Replies: 3
Views: 2938

PostForum: Other puzzles   Posted: Wed Sep 28, 2022 10:58 pm   Subject: VH+ 092722
Thanks for the puzzle immp! I enjoyed that one. Here's the grid that I ended up with after basics:

+----------------+--------------+-----------+
| 459 245 249 | 24 1 6 | 3 8 7 |
| ...
 
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