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 

1sudoku Evil puzzle

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



Joined: 06 Mar 2014
Posts: 563

PostPosted: Sun Jul 08, 2018 2:26 pm    Post subject: 1sudoku Evil puzzle Reply with quote

I enjoyed finding a one step solution for this one today. (Helmut's VH today was too easy.)
Code:

1sudoku.com, #56259, Evil.
 +-------+-------+-------+
 | . . 1 | 8 . . | . 4 . |
 | . 4 . | 1 3 . | . . 9 |
 | . . 7 | . . . | 2 . . |
 +-------+-------+-------+
 | 7 . . | . 1 . | . . . |
 | . 8 . | . 5 . | . 1 . |
 | . . . | . 4 . | . . 3 |
 +-------+-------+-------+
 | . . 6 | . . . | 5 . . |
 | 9 . . | . 7 4 | . 3 . |
 | . 3 . | . . 6 | 8 . . |
 +-------+-------+-------+

[/code]
Back to top
View user's profile Send private message
Clement



Joined: 24 Apr 2006
Posts: 1110
Location: Dar es Salaam Tanzania

PostPosted: Sun Jul 08, 2018 5:52 pm    Post subject: Reply with quote

Code:

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

Play this puzzle online at the Daily Sudoku site


Last edited by Clement on Mon Jul 09, 2018 8:18 am; edited 1 time in total
Back to top
View user's profile Send private message AIM Address
dongrave



Joined: 06 Mar 2014
Posts: 563

PostPosted: Sun Jul 08, 2018 9:50 pm    Post subject: Reply with quote

Hey! I thought Clement would provide a solution, not the starting grid that I posted? What's up with that? (Did I make a mistake in the grid?)
Back to top
View user's profile Send private message
Clement



Joined: 24 Apr 2006
Posts: 1110
Location: Dar es Salaam Tanzania

PostPosted: Mon Jul 09, 2018 7:26 am    Post subject: Reply with quote

dongrave wrote:
Hey! I thought Clement would provide a solution, not the starting grid that I posted? What's up with that? (Did I make a mistake in the grid?)
No, you did not make a mistake. My aim was to make a printable version and after that delete it, I failed to delete the submission as I usually do. I am sorry for that, I will provide a solution. It is good puzzle Dongrave.
Back to top
View user's profile Send private message AIM Address
Clement



Joined: 24 Apr 2006
Posts: 1110
Location: Dar es Salaam Tanzania

PostPosted: Mon Jul 09, 2018 8:13 am    Post subject: Reply with quote

Two steps a chain and W-Wing
Code:

+-------------------------+-----------------------+----------------------+
| e26*      e269     1    | 8        d269     7   | 3        4       5   |
| 8          4      g25   | 1         3       25  | 67       67      9   |
| 3         f569     7    | 4         69      59  | 2        8       1   |
+-------------------------+-----------------------+----------------------+
| 7          6-2     2349 | 269       1       239 | 469      5       8   |
| j246       8       2349 | 2679      5       239 | 4679     1       27  |
| 5          1       29   | 2679      4       8   | 679      267     3   |
+-------------------------+-----------------------+----------------------+
| i4*-2      7       6    | 3         8       1   | 5        9       24  |
| 9         a25      8    | b25       7       4   | 1        3       6   |
| 1          3      h245  | 259      c29      6   | 8        27      247 |
+-------------------------+-----------------------+----------------------+

Step 1: (2)r8c2 = r8c4 - r9c5 = r1c5 - (2=6*9)r1c12 - (69=5)r3c2 - r2c3 = (5-4)r9c3 = (4*)r7c1 - (4*6*=2)r5c1 => - 2r4c2,r7c1
Code:
Opens the following Grid
+------------------+---------------------+----------------+
| 6     a29     1  | 8       2-9     7   | 3      4     5 |
| 8      4     b25 | 1       3       25  | 7      6     9 |
| 3      59     7  | 4       6       59  | 2      8     1 |
+------------------+---------------------+----------------+
| 7      6      34 | 29      1       239 | 49     5     8 |
| 2      8      34 | 6       5       39  | 49     1     7 |
| 5      1      9  | 7       4       8   | 6      2     3 |
+------------------+---------------------+----------------+
| 4      7      6  | 3       8       1   | 5      9     2 |
| 9      25     8  | 25      7       4   | 1      3     6 |
| 1      3     c25 | 259   d29       6   | 8      7     4 |
+------------------+---------------------+----------------+

Step 2: Wing on (29)r1c2,r9c5 with SL in col3
(9=2)r1c2 - r2c3 = r9c3 - (2=9)r9c5 = - 9r1c5; stte
There may be a better solution.
Back to top
View user's profile Send private message AIM Address
dongrave



Joined: 06 Mar 2014
Posts: 563

PostPosted: Mon Jul 09, 2018 8:11 pm    Post subject: Reply with quote

Thanks Clement! I found a one step solution. You want to see it? (I think I got the notation right.) Let me know if I screwed up the notation (or the entire solution!)
(5=2)r8c4-(2=679)r456c4-(9=23)r45c6-(2=5)r2c6-r2c3=r3c2=>r8c2<>5.
Back to top
View user's profile Send private message
Clement



Joined: 24 Apr 2006
Posts: 1110
Location: Dar es Salaam Tanzania

PostPosted: Tue Jul 10, 2018 10:31 am    Post subject: Reply with quote

dongrave wrote:
Thanks Clement! I found a one step solution. You want to see it? (I think I got the notation right.) Let me know if I screwed up the notation (or the entire solution!)
(5=2)r8c4-(2=679)r456c4-(9=23)r45c6-(2=5)r2c6-r2c3=r3c2=>r8c2<>5.
Yes, it is a good, better solution including the notation. Bravo!
Back to top
View user's profile Send private message AIM Address
dongrave



Joined: 06 Mar 2014
Posts: 563

PostPosted: Wed Jul 11, 2018 1:04 am    Post subject: Reply with quote

Clement wrote:
dongrave wrote:
Thanks Clement! I found a one step solution. You want to see it? (I think I got the notation right.) Let me know if I screwed up the notation (or the entire solution!)
(5=2)r8c4-(2=679)r456c4-(9=23)r45c6-(2=5)r2c6-r2c3=r3c2=>r8c2<>5.
Yes, it is a good, better solution including the notation. Bravo!

Thanks Clement! You probably don't remember but I learned about chains w/ pincers on both ends a couple of years ago from you (Marty had to explain them to me!). They immediately became my favorite method of solving puzzles in one step.
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