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  Topic: Jan 22 VH
peter urhegyi

Replies: 10
Views: 311

PostForum: Daily Sudoku puzzles   Posted: Mon Jan 24, 2022 9:09 am   Subject: 5 step daily sudoku 22-01-2022
Dongrave found 4 of the 5 steps:
1)x-wing on 9's in cols 1&4
2)x-wing on 3's in cols 4&7
3)xyz-wing 578 with pivot at R6C7 (R4C7!=5)
4)xy-wing 58-3 with pivot at R4C5 (R4C4!=3 and R5C8!=3) ...
  Topic: Sep 25 VH
peter urhegyi

Replies: 7
Views: 2966

PostForum: Daily Sudoku puzzles   Posted: Mon Sep 27, 2021 7:30 am   Subject: daily sudoku 25-09-2021
I found 3 xy-wings to start(2 of them are needed).
After this an x-wing and an xyz-wing eliminating 2 candidates from R2C6 leads to a triple in row 2 and further solves with basics.
  Topic: very hard rated by draw and play
peter urhegyi

Replies: 5
Views: 3722

PostForum: Other puzzles   Posted: Wed Aug 25, 2021 9:35 pm   Subject: very hard rated by draw and play
I think this must be a mistake by the internal rating function. It doesn't need any vh step.

+-------+-------+-------+
| 1 . . | . . 7 | 9 . 4 |
| . 3 . | . 8 . | . . . |
| . . . | . . 6 | . 2 . ...
  Topic: 14-08-21-vh+
peter urhegyi

Replies: 2
Views: 3183

PostForum: Other puzzles   Posted: Sat Aug 14, 2021 6:01 am   Subject: 14-08-21-vh+

+-------+-------+-------+
| . . . | . . . | 1 . 3 |
| . 6 . | 9 . 3 | . 4 . |
| 5 . . | . . . | . . . |
+-------+-------+-------+
| . . . | 5 . 4 | . 9 . |
| 2 . 8 | . . . | . . . |
| . 5 . | ...
  Topic: Jun 28 VH
peter urhegyi

Replies: 5
Views: 4834

PostForum: Daily Sudoku puzzles   Posted: Tue Jun 29, 2021 7:37 am   Subject: Daily sudoku Jun 28 VH
In case anyone will try the classical solution with only xy(z) wings requires 2 xyz-wings and 2 xy-wings that are all necessary to solve.
  Topic: May 24 VH?
peter urhegyi

Replies: 3
Views: 5257

PostForum: Daily Sudoku puzzles   Posted: Mon May 24, 2021 6:12 pm   Subject: May 24 VH?
Solved with only basic techniques.
  Topic: Feb 16 not VH at all
peter urhegyi

Replies: 11
Views: 9586

PostForum: Daily Sudoku puzzles   Posted: Tue Feb 16, 2021 9:46 pm   Subject: Feb 16 not VH at all
The swordfish is the three rows/columns equivalent of the x-wing with only two rows/columns. I've looked to a few daily puzzles published in the last years and found only two of them where swordfishes ...
  Topic: Feb 16 not VH at all
peter urhegyi

Replies: 11
Views: 9586

PostForum: Daily Sudoku puzzles   Posted: Tue Feb 16, 2021 7:14 pm   Subject: Re: 16/02/2021 Daily very hard?
Hi Peter, The 3's in r35c1 that you used are the 3's 'Locked Candidates' that I mentioned! That's exactly how locked candidates work! By the way, I looked at the grid that I posted to see if I could ...
  Topic: Feb 16 not VH at all
peter urhegyi

Replies: 11
Views: 9586

PostForum: Daily Sudoku puzzles   Posted: Tue Feb 16, 2021 4:02 pm   Subject: 16/02/2021 Daily very hard?
I solved it with the 2 3's at R35C1. One of them must be 3 so R5C2=8. But if you like a very hard step, which is not needed, there's a skyscraper (also remote pair or even w-wing) at R59 linked by two ...
  Topic: Daily Diabolical 11/12/2020
peter urhegyi

Replies: 3
Views: 6391

PostForum: Other puzzles   Posted: Thu Dec 10, 2020 11:33 pm   Subject: Daily Diabolical 11/12/2020
I had a lot of fun to solve this and hope to see other nice solutions. Mine has four steps and needed a wxyz-wing.

+-------+-------+-------+
| . . . | 3 . 9 | . . . |
| . . 5 | . 2 . | 8 . . |
| ...
  Topic: 17-11 VH+ multistepper
peter urhegyi

Replies: 1
Views: 4831

PostForum: Other puzzles   Posted: Mon Nov 16, 2020 10:36 pm   Subject: 17-11 VH+ multistepper

+-------+-------+-------+
| . . 5 | 7 . . | . . . |
| 2 . . | . . . | . 8 . |
| . 3 . | . 9 . | 5 . . |
+-------+-------+-------+
| 6 . . | . . 5 | 7 . . |
| . 9 . | . 3 . | . . 4 |
| . . 7 | ...
  Topic: Nov 16 hard
peter urhegyi

Replies: 0
Views: 4990

PostForum: Daily Sudoku puzzles   Posted: Mon Nov 16, 2020 9:22 am   Subject: Nov 16 hard
I never saw a post in this forum about a hard sudoku. Unfortunately only the VH ones seems to deserve a discussion on this forum even when they are very nice and worth to be solved like today's one.
...
  Topic: First time I post a vh sudoku
peter urhegyi

Replies: 9
Views: 10122

PostForum: Other puzzles   Posted: Mon Nov 09, 2020 5:25 pm   Subject: First time I post a vh sudoku
Lots of neat stuff in this one peter. Even spotted a swordfish (or two). Thanks for posting.

cheers...immp
Thank you. After the discovery of the 2 swordfishes thisone needs only an x-wing , an xy- ...
  Topic: First time I post a vh sudoku
peter urhegyi

Replies: 9
Views: 10122

PostForum: Other puzzles   Posted: Mon Nov 09, 2020 11:21 am   Subject: The pencilmarks grid from this 5-step VH sudoku
.-------------------.--------------------.------------------.
| 589 579 1 | 2 6789 789 | 3 467 4689 |
| 389 2 36789 | 1689 36789 4 | 5 167 689 |
| 4 379 ...
  Topic: First time I post a vh sudoku
peter urhegyi

Replies: 9
Views: 10122

PostForum: Other puzzles   Posted: Mon Nov 09, 2020 10:47 am   Subject: First time I post a vh sudoku
..12..3..
.2...45..
4...5...2
6...4...1
..57..8..
.8...6..5
76..1...3
.......97
..23..18.
 
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