dailysudoku.com Forum Index dailysudoku.com
Discussion of Daily Sudoku puzzles
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Unfair 010222

 
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Other puzzles
View previous topic :: View next topic  
Author Message
immpy



Joined: 06 May 2017
Posts: 570

PostPosted: Sun Jan 02, 2022 7:18 pm    Post subject: Unfair 010222 Reply with quote

Hello all, enjoy the puzzle.

Code:

+-------+-------+-------+
| 3 . 8 | . 9 . | . . . |
| 9 2 . | 7 . . | . . . |
| . 7 . | . 2 6 | . . 8 |
+-------+-------+-------+
| . 3 7 | . . . | . . 9 |
| . 4 . | . . . | . 1 . |
| 8 . . | . . . | 2 5 . |
+-------+-------+-------+
| 2 . . | 4 3 . | . 8 . |
| . . . | . . 9 | . 7 1 |
| . . . | . 5 . | 3 . 2 |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site

cheers...immp
Back to top
View user's profile Send private message
Mogulmeister



Joined: 03 May 2007
Posts: 1151

PostPosted: Sun Jan 02, 2022 8:43 pm    Post subject: Reply with quote

Code:
+----------------+------------------+-----------------+
| 3   156  8     | 15   9    145    | 14567 2   4567  |
| 9   2    1456  | 7    148  13458  | 1456  346 456   |
| 14  7    145   | 135  2    6      | 1459  349 8     |
+----------------+------------------+-----------------+
| 156 3    7     | 1568 1468 2      | 468   46  9     |
| 56  4    2     | 9    678  358    | 678   1   367   |
| 8   169  169   | 136  1467 134    | 2     5   3467  |
+----------------+------------------+-----------------+
| 2   1569 1569  | 4    3    7      | 569   8   56    |
| 46  568  3     | 2    68   9      | 456   7   1     |
| 7   689  469   | 168  5    18     | 3     469 2     |
+----------------+------------------+-----------------+

After basics.

(1=4)r3c1-(4=6)r8c1-(6=8)r8c5-r9c4=(8-5)r4c4=(5-1)r4c1=1r3c1

Making r3c1 4 creates a contradiction loop that shows that the start cell r3c1 < > 4 ie must be 1.

r3c1 < > 4 leads to a bit more basics (19 pair) then stte.


Last edited by Mogulmeister on Mon Jan 03, 2022 6:51 am; edited 1 time in total
Back to top
View user's profile Send private message
Mogulmeister



Joined: 03 May 2007
Posts: 1151

PostPosted: Sun Jan 02, 2022 9:18 pm    Post subject: Reply with quote

Thanks Immp. Nice puzzle and Happy New Year to all.
Back to top
View user's profile Send private message
TomC



Joined: 30 Oct 2020
Posts: 349
Location: Wales

PostPosted: Mon Jan 03, 2022 9:38 am    Post subject: Reply with quote

r6c456 <> 1 as this would create a <468> quad in row 4

Easier to see than explain, but here goes:

if r6c4=1, then r1c4=5, so r4 has [68 468 468 46]

if r6c56=1, then <69> pair gives r6c4=3, <15> in r13c4 and again r4 has [68 468 468 46]

fairly simple stuff to the end
Back to top
View user's profile Send private message
Mogulmeister



Joined: 03 May 2007
Posts: 1151

PostPosted: Mon Jan 03, 2022 11:16 am    Post subject: Reply with quote

The “quad” being an impossibility because only three discrete numbers exist in four squares.
Back to top
View user's profile Send private message
TomC



Joined: 30 Oct 2020
Posts: 349
Location: Wales

PostPosted: Mon Jan 03, 2022 7:39 pm    Post subject: Reply with quote

My explanation clearly wasn't complete, so....

It's impossible
For a quad to hold just three
It's just impossible
Back to top
View user's profile Send private message
Mogulmeister



Joined: 03 May 2007
Posts: 1151

PostPosted: Tue Jan 04, 2022 8:09 am    Post subject: Reply with quote

Can this triple keep from rushing to be four ?
It's just impossible
If I had three could I ever want for more?
It's just impossible
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Other puzzles All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group