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  Topic: VH 3rd December
Mogulmeister

Replies: 5
Views: 247

PostForum: Daily Sudoku puzzles   Posted: Fri Dec 03, 2021 4:35 pm   Subject: VH 3rd December
Another way to look at this is to see that we have an almost XY wing - the killer <179> as used above.

However, at the start that is spoiled by the extra 8 in r5c1.

Either the 8 at r5c1 ...
  Topic: VH 3rd December
Mogulmeister

Replies: 5
Views: 247

PostForum: Daily Sudoku puzzles   Posted: Fri Dec 03, 2021 12:49 pm   Subject: VH 3rd December
Hi Earl - good spot.
  Topic: VH 3rd December
Mogulmeister

Replies: 5
Views: 247

PostForum: Daily Sudoku puzzles   Posted: Fri Dec 03, 2021 9:08 am   Subject: VH 3rd December
After basics
+--------------+-----------------+--------------+
| 46 3 5 | 478 9 478 | 1 2 68 |
| 469 47 479 | 48 2 1 | 3 5 68 |
| 2 1 8 | 5 3 6 ...
  Topic: VH 3rd December
Mogulmeister

Replies: 5
Views: 247

PostForum: Daily Sudoku puzzles   Posted: Fri Dec 03, 2021 9:05 am   Subject: VH 3rd December

+-------+-------+-------+
| . 3 5 | . 9 . | . 2 . |
| . . . | . . 1 | 3 5 . |
| 2 . . | . . 6 | 4 . 7 |
+-------+-------+-------+
| . . . | . . . | . 3 9 |
| . . 6 | . 4 . | 2 . . |
| 3 5 . | ...
  Topic: All kinds of Stuff
Mogulmeister

Replies: 7
Views: 666

PostForum: Other puzzles   Posted: Mon Nov 29, 2021 4:32 pm   Subject: All kinds of Stuff
Then if you go:

(4=1)r8c2-(1=2)r4c2-(2)r9c2=(2)r9c3-(2=4)r1c3 and r8c3 <> 4.

Or you can express this chain in contradictory language:

Put 1 in r8c2 and that puts a 4 in r1c3 and no 4 ...
  Topic: All kinds of Stuff
Mogulmeister

Replies: 7
Views: 666

PostForum: Other puzzles   Posted: Mon Nov 29, 2021 4:25 pm   Subject: All kinds of Stuff
I used Immpy's skyscraper for 2's in columns 3 and 6 which eliminated the 2's in r7c1 and r9c4 and left the field of play eventually looking like this


+----------------+--------------+----------- ...
  Topic: All kinds of Stuff
Mogulmeister

Replies: 7
Views: 666

PostForum: Other puzzles   Posted: Mon Nov 29, 2021 12:51 pm   Subject: All kinds of Stuff
Any other answers ? All solutions welcome!
  Topic: All kinds of Stuff
Mogulmeister

Replies: 7
Views: 666

PostForum: Other puzzles   Posted: Wed Nov 24, 2021 7:51 pm   Subject: All kinds of Stuff
Thanks Immp. You’ve done well uncovering some of those techniques. Hopefully this one appeals to players of all stripes !
  Topic: All kinds of Stuff
Mogulmeister

Replies: 7
Views: 666

PostForum: Other puzzles   Posted: Wed Nov 24, 2021 3:51 am   Subject: All kinds of Stuff
+-------------------+-----------------+--------------+
| 5 8 24 | 2349 34 2349 | 1 6 7 |
| 17 6 17 | 24 5 8 | 3 9 24 |
| 234 234 9 | 7 16 1 ...
  Topic: VH Nov 23rd
Mogulmeister

Replies: 5
Views: 593

PostForum: Daily Sudoku puzzles   Posted: Tue Nov 23, 2021 1:42 pm   Subject: VH Nov 23rd
https://i.imgur.com/8tEpPvs.png

I've shown the above contradictions in pictorial form - they either put too many 3's in one box or remove them altogether in another.

You can also form a loopback ...
  Topic: VH Nov 23rd
Mogulmeister

Replies: 5
Views: 593

PostForum: Daily Sudoku puzzles   Posted: Tue Nov 23, 2021 9:25 am   Subject: VH Nov 23rd
Just for a diversion but to encourage those of you who should be exploring the dark side of sudoku:

If you say r6c1 = 3 you will put two 3's in box 2.

R6c1 < > 3

Which is the same elim ...
  Topic: VH Nov 23rd
Mogulmeister

Replies: 5
Views: 593

PostForum: Daily Sudoku puzzles   Posted: Tue Nov 23, 2021 9:09 am   Subject: VH Nov 23rd

+--------------+--------------+--------------+
| 1 35 25 | 8 4 39 | 257 6 579 |
| 346 7 56 | 39 1 2 | 8 59 459 |
| 24 9 8 | 5 7 6 | 24 1 3 |
+----- ...
  Topic: VH Nov 23rd
Mogulmeister

Replies: 5
Views: 593

PostForum: Daily Sudoku puzzles   Posted: Tue Nov 23, 2021 8:54 am   Subject: VH Nov 23rd

+-------+-------+-------+
| 1 . . | 8 4 . | . 6 . |
| . 7 . | . . 2 | . . . |
| . . 8 | 5 . . | . 1 3 |
+-------+-------+-------+
| 9 8 1 | . 5 . | . . . |
| . . . | . . . | . . . |
| . . . | ...
  Topic: All kinds of Stuff
Mogulmeister

Replies: 7
Views: 666

PostForum: Other puzzles   Posted: Sun Nov 21, 2021 7:19 pm   Subject: All kinds of Stuff
OK here we go - lots of ways home. Single and multi steps all good!



+-----------------------+
| 5 . . | . . . | . 6 7 |
| . 6 . | . . . | 3 . . |
| . . 9 | 7 . . | 5 . . |
|------ ...
  Topic: VH Nov 20th
Mogulmeister

Replies: 12
Views: 886

PostForum: Daily Sudoku puzzles   Posted: Sun Nov 21, 2021 4:32 pm   Subject: VH Nov 20th
Always.
  Topic: VH 111821
Mogulmeister

Replies: 6
Views: 810

PostForum: Other puzzles   Posted: Sun Nov 21, 2021 4:21 pm   Subject: VH 111821
Nice.
  Topic: VH Nov 20th
Mogulmeister

Replies: 12
Views: 886

PostForum: Daily Sudoku puzzles   Posted: Sat Nov 20, 2021 11:54 pm   Subject: VH Nov 20th
Another wrinkle on this is one where you have a start cell with 2 or 3 candidates in it and a target cell which always reduces to the same value whatever candidate you choose to start with.

In th ...
  Topic: VH Nov 20th
Mogulmeister

Replies: 12
Views: 886

PostForum: Daily Sudoku puzzles   Posted: Sat Nov 20, 2021 11:30 pm   Subject: VH Nov 20th
Your method Tom is essentially contradiction based. The art of the impossible.Proof by negative assertion.

By plugging in a value you propagate changes in the fabric of a puzzle that might breakdow ...
  Topic: VH Nov 20th
Mogulmeister

Replies: 12
Views: 886

PostForum: Daily Sudoku puzzles   Posted: Sat Nov 20, 2021 9:25 am   Subject: VH Nov 20th
https://i.imgur.com/sVb1NBG.png

A nice ALS

Set A is Yellow {2,4,8}
Set B is Purple {2,3,4,8}

Restricted common is 8

Common candidate 4 is eliminated from r5c5.
  Topic: VH Nov 20th
Mogulmeister

Replies: 12
Views: 886

PostForum: Daily Sudoku puzzles   Posted: Sat Nov 20, 2021 8:17 am   Subject: VH Nov 20th
+----------------+---------------+------------------+
| 9 5 18 | 4 2 3 | 78 6 17 |
| 236 238 12368 | 7 68 9 | 5 4 12 |
| 4 7 268 | 568 568 1 | ...
 
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