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  Topic: VH+ 010723
dongrave

Replies: 4
Views: 1650

PostForum: Other puzzles   Posted: Fri Jan 20, 2023 2:50 am   Subject: VH+ 010723
So that's it? No one else is going to post a solution for this one? If that's the case, then I guess this really was a VH++! (Ugh!)
  Topic: VH++ 011723
dongrave

Replies: 3
Views: 978

PostForum: Other puzzles   Posted: Wed Jan 18, 2023 2:18 pm   Subject: VH++ 011723
Thanks for puzzle immp! That one seemed like a VH+ to me (but your previous one seemed like a VH++! Smile

Here's the grid that I ended up with after basics:

+---------------+-------------+------- ...
  Topic: VH+ 010723
dongrave

Replies: 4
Views: 1650

PostForum: Other puzzles   Posted: Wed Jan 11, 2023 5:50 pm   Subject: VH+ 010723
I had a tough time with this one immpy!

After basics:
+---------------+---------------+-----------------+
| 236 26 5 | 4 367 2367 | 8 9 1 |
| 7 9 248 | 5 1 28 | 3 ...
  Topic: Jan 11 VH
dongrave

Replies: 1
Views: 805

PostForum: Daily Sudoku puzzles   Posted: Wed Jan 11, 2023 2:19 pm   Subject: Jan 11 VH
I used the 45-8 XY-Wing at r7c68,r9c5 for the 1st step (-8 in r9c89, and -8 in r1c7 due to the 8 LC's in column 9) which opened up the 38-5 XY-Wing at r1c57,r3c4 for the 2nd step (-5 in r1c6,r3c9).
  Topic: VH+ 122922
dongrave

Replies: 3
Views: 1775

PostForum: Other puzzles   Posted: Fri Dec 30, 2022 7:52 pm   Subject: VH+ 122922
After basics:
+--------------------+----------------+---------------+
| b18 5 c168 | 2 d168 3 | 79 4 79 |
| 2 9 3468 | 47 468 78 | 5 1 36 |
| a1*3 h146 ...
  Topic: VH++ 121522
dongrave

Replies: 8
Views: 3437

PostForum: Other puzzles   Posted: Mon Dec 19, 2022 8:45 pm   Subject: VH++ 121522
Oh no! Please reconsider immp! I like your VH, VH+, and VH++ ratings!

(Edit:) immp! After giving this just a little more thought I realized that there's really no difference between your curre ...
  Topic: a 10.1 from coloin
dongrave

Replies: 9
Views: 3717

PostForum: Other puzzles   Posted: Sun Dec 18, 2022 9:28 pm   Subject: a 10.1 from coloin
For anyone that's interested in eleven's 'variable replacement' method, this is how I used it today to solve this puzzle.
This was the grid that I ended up with after basics:

+------------------+- ...
  Topic: a 10.1 from coloin
dongrave

Replies: 9
Views: 3717

PostForum: Other puzzles   Posted: Sun Dec 18, 2022 7:07 pm   Subject: a 10.1 from coloin
Wow! Eleven's Variable Replacement is ingenious! I did a google search on 'sudoku eleven variable replacement' and read a long detailed explanation of it today! Then I used it to solve this puzzle! ...
  Topic: a 10.1 from coloin
dongrave

Replies: 9
Views: 3717

PostForum: Other puzzles   Posted: Sat Dec 17, 2022 7:34 pm   Subject: a 10.1 from coloin
Do you mean that it can be solved by humans using the 3 dozen or so techniques that human Sudoku experts use? Or do you mean that it can be solved AT ALL by humans - including trial and error?
  Topic: VH++ 121522
dongrave

Replies: 8
Views: 3437

PostForum: Other puzzles   Posted: Sat Dec 17, 2022 2:16 am   Subject: VH++ 121522
Thanks for the puzzle immp! A 'bit' more difficult? Ha!

This was the grid that I ended up with after basics:

+------------------+------------------+---------------+
| 469 69 5 | 3 ...
  Topic: VH+ 112622
dongrave

Replies: 2
Views: 3131

PostForum: Other puzzles   Posted: Sun Dec 04, 2022 4:00 pm   Subject: VH+ 112622
Thanks for the puzzle, immp!

After basics:
+------------------+-----------------+---------------+
| 1 3456 c56 | 45 28 28 | 7 345 9 |
| 9 245 25 | 7 3 6 | 2 ...
  Topic: Nov 25 VH
dongrave

Replies: 2
Views: 2498

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: 4146

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: 4146

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: 4146

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: 3754

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: 2993

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: 2993

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: 2061

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: 2814

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 ...
 
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