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  Topic: Jan 27 VH
Mogulmeister

Replies: 17
Views: 119

PostForum: Daily Sudoku puzzles   Posted: Thu Jan 27, 2022 9:50 pm   Subject: Jan 27 VH
You are the Frank Carson of Sudoku! (even if he's the wrong type of Celt)
  Topic: Jan 27 VH
Mogulmeister

Replies: 17
Views: 119

PostForum: Daily Sudoku puzzles   Posted: Thu Jan 27, 2022 9:44 pm   Subject: Jan 27 VH
The point is once something is wrong contradictions appear everywhere and in many forms.
  Topic: Jan 27 VH
Mogulmeister

Replies: 17
Views: 119

PostForum: Daily Sudoku puzzles   Posted: Thu Jan 27, 2022 9:43 pm   Subject: Jan 27 VH
If r5c9=9 then r4c4=9, x=9 , no <9> in c3 is where I thought you were

Which is fair enough too !
  Topic: Jan 27 VH
Mogulmeister

Replies: 17
Views: 119

PostForum: Daily Sudoku puzzles   Posted: Thu Jan 27, 2022 9:43 pm   Subject: Jan 27 VH
Understand now, I just think if you drop a number from a column you remove it

Think loops! All those contradiction loops that set off on their logical path and turn round to bite themselves on the ...
  Topic: Jan 27 VH
Mogulmeister

Replies: 17
Views: 119

PostForum: Daily Sudoku puzzles   Posted: Thu Jan 27, 2022 9:40 pm   Subject: Jan 27 VH
Again another similar result using the 9's

r5c9 <> 9 as then d=9, a=9,

and if I can complete your chain Tom..and r4c4 is < >9 and r4c9 is 9 !
  Topic: Jan 27 VH
Mogulmeister

Replies: 17
Views: 119

PostForum: Daily Sudoku puzzles   Posted: Thu Jan 27, 2022 9:35 pm   Subject: Jan 27 VH
We were here before with Immp's puzzle too ?
  Topic: Jan 27 VH
Mogulmeister

Replies: 17
Views: 119

PostForum: Daily Sudoku puzzles   Posted: Thu Jan 27, 2022 9:34 pm   Subject: Jan 27 VH
In case you're a visual type (I am)

Green is true and red is false

https://i.imgur.com/NzOAAMx.png
  Topic: Jan 27 VH
Mogulmeister

Replies: 17
Views: 119

PostForum: Daily Sudoku puzzles   Posted: Thu Jan 27, 2022 9:21 pm   Subject: Jan 27 VH
So lets start with your 9 in r5c9

(17=9)r5c9-r5c3=r7c3-r9c1=r9c4-r4c5=(9-17)r4c9

Two 9's in column 9 so r5c9 < > 9
  Topic: Jan 27 VH
Mogulmeister

Replies: 17
Views: 119

PostForum: Daily Sudoku puzzles   Posted: Thu Jan 27, 2022 8:47 pm   Subject: Jan 27 VH
Ö.and drops two 9ís in column 9 !
  Topic: Jan 27 VH
Mogulmeister

Replies: 17
Views: 119

PostForum: Daily Sudoku puzzles   Posted: Thu Jan 27, 2022 4:16 pm   Subject: Jan 27 VH

+-----------+----------+----------+
|67 8 67 | 5 1 2 | 3 9 4 |
| 3 4 1 | 7 9 8 | 2 5 6 |
| 5 9 2 | 6 4 3 | 18 7 18 |
+-----------+----------+----------+
| 8 17 ...
  Topic: VH+ 012122
Mogulmeister

Replies: 6
Views: 211

PostForum: Other puzzles   Posted: Tue Jan 25, 2022 5:01 pm   Subject: VH+ 012122
This took me a little while to understand this solution

I now can see it as if c=3, d=1, a=8 and then no <8> in box 9

Or.....c=3 d=1 so a=8

and at the same time

c=3 and b=8

Two ...
  Topic: VH+ 012122
Mogulmeister

Replies: 6
Views: 211

PostForum: Other puzzles   Posted: Tue Jan 25, 2022 4:46 pm   Subject: VH+ 012122
The ANP <137> in r8c12 also comes to the same conclusion:

ANP true and r8c7 = 8 r5c7 =1 and r4c9 < > 1
ANP false and r7c2 =1 r7c4= 7 r7c8 =3 so r5c8 < > 3 and r4c9 = 3 (< > ...
  Topic: VH+ 012122
Mogulmeister

Replies: 6
Views: 211

PostForum: Other puzzles   Posted: Tue Jan 25, 2022 4:12 pm   Subject: VH+ 012122
In general if you see 3 strong links in a four sided structure itís worth looking at. Whether a is 1 or 8 it eliminates 1 from r4c9.

Equally you could set r4c9 to 1 and your contradiction loop d- ...
  Topic: VH+ 012122
Mogulmeister

Replies: 6
Views: 211

PostForum: Other puzzles   Posted: Mon Jan 24, 2022 11:46 am   Subject: VH+ 012122
On a solving note, this came to me when I saw what I thought was going to be a skyscraper on 1's ab and cd. The extra 1's in r29c9 put paid to that idea but then I noticed that the cd "leg" ...
  Topic: Jan 22 VH
Mogulmeister

Replies: 10
Views: 389

PostForum: Daily Sudoku puzzles   Posted: Mon Jan 24, 2022 11:38 am   Subject: Jan 22 VH
Another second step using Gianniís grid is -8 in r4c9 as this is needed to avoid the <57> UR in r26c78

This has certainly been the trickiest VH for a while!

Good spot Tom
  Topic: Jan 22 VH
Mogulmeister

Replies: 10
Views: 389

PostForum: Daily Sudoku puzzles   Posted: Mon Jan 24, 2022 11:21 am   Subject: Jan 22 VH
I don't know for sure, but if that had appeared in The Telegraph it might well have been deemed a diabolical ?
  Topic: VH Jan 24th
Mogulmeister

Replies: 1
Views: 158

PostForum: Daily Sudoku puzzles   Posted: Mon Jan 24, 2022 11:16 am   Subject: VH Jan 24th
From the sublime to the.....
  Topic: VH Jan 24th
Mogulmeister

Replies: 1
Views: 158

PostForum: Daily Sudoku puzzles   Posted: Mon Jan 24, 2022 11:14 am   Subject: VH Jan 24th

+-------+-------+-------+
| . 2 . | . 7 . | . . 5 |
| . . 9 | 4 . 2 | . . 1 |
| . . . | 3 . . | 6 9 . |
+-------+-------+-------+
| . . 5 | . . . | . 1 . |
| . 7 . | 9 . 3 | . 8 . |
| . 3 . | ...
  Topic: Jan 22 VH
Mogulmeister

Replies: 10
Views: 389

PostForum: Daily Sudoku puzzles   Posted: Mon Jan 24, 2022 9:23 am   Subject: Jan 22 VH
Thanks Peter.
  Topic: Jan 22 VH
Mogulmeister

Replies: 10
Views: 389

PostForum: Daily Sudoku puzzles   Posted: Mon Jan 24, 2022 7:19 am   Subject: Jan 22 VH
Don,

Given the variable nature of the grading algorithm, what grade do you think this one was at ?
 
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