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 

Puzzle 10/01/20 (C)

 
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Puzzles by daj
View previous topic :: View next topic  
Author Message
daj95376



Joined: 23 Aug 2008
Posts: 3854

PostPosted: Wed Jan 20, 2010 10:29 pm    Post subject: Puzzle 10/01/20 (C) Reply with quote

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

Play this puzzle online at the Daily Sudoku site
Back to top
View user's profile Send private message
Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Fri Jan 22, 2010 4:26 pm    Post subject: Reply with quote

Type 4 UR (39)
X-Wing (9)
Two short XY-Chains
Back to top
View user's profile Send private message
gindaani



Joined: 06 Mar 2009
Posts: 79

PostPosted: Fri Jan 22, 2010 11:21 pm    Post subject: Reply with quote

I don't see the 39 UR. After the basics, I had:

Code:

+--------+-------------+-------------+
| 5 8  9 | 4   36   1  | 7   36   2  |
| 3 7  4 | 69  2    5  | 69  8    1  |
| 6 2  1 | 39  8    7  | 5   4    39 |
+--------+-------------+-------------+
| 4 56 2 | 8   1359 39 | 136 1356 7  |
| 1 56 7 | 35  4    2  | 369 3569 8  |
| 8 9  3 | 157 157  6  | 2   15   4  |
+--------+-------------+-------------+
| 2 13 5 | 67  67   4  | 8   139  39 |
| 7 13 8 | 135 1359 39 | 4   2    6  |
| 9 4  6 | 2   13   8  | 13  7    5  |
+--------+-------------+-------------+

Play this puzzle online at the Daily Sudoku site

I used:
Quote:
skyscraper 3 r7c8<>3
53-39-93-31-13-39-91-15 r6c45<>5 r5c8<>5
65-53-39-93-31-13-39-93-36 r5c8<>6
36-9 xyz wing r5c7<>9

Back to top
View user's profile Send private message
Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Sat Jan 23, 2010 1:13 am    Post subject: Reply with quote

Quote:
I don't see the 39 UR.

In column 5, the 9s are a strong link. This is the definition of a Type 4 UR (strong link on one of the numbers) and the other number, in this case, 3, is removed from both cells.
Back to top
View user's profile Send private message
daj95376



Joined: 23 Aug 2008
Posts: 3854

PostPosted: Sat Jan 23, 2010 3:29 am    Post subject: Reply with quote

After basics:

Code:
 <39> UR Type 4 in r48c56
 Type 4 because of X-Wing on <9> in these cells
 => r48c5<>3
 *-----------------------------------------------------------*
 | 5     8     9     | 4     36    1     | 7     36    2     |
 | 3     7     4     | 69    2     5     | 69    8     1     |
 | 6     2     1     | 39    8     7     | 5     4     39    |
 |-------------------+-------------------+-------------------|
 | 4     56    2     | 8    *1359 *39    | 136   1356  7     |
 | 1     56    7     | 35    4     2     | 369   3569  8     |
 | 8     9     3     | 157   157   6     | 2     15    4     |
 |-------------------+-------------------+-------------------|
 | 2     13    5     | 67    67    4     | 8     139   39    |
 | 7     13    8     | 135  *1359 *39    | 4     2     6     |
 | 9     4     6     | 2     13    8     | 13    7     5     |
 *-----------------------------------------------------------*
Back to top
View user's profile Send private message
daj95376



Joined: 23 Aug 2008
Posts: 3854

PostPosted: Sat Jan 23, 2010 12:28 pm    Post subject: Reply with quote

It's been over two days since I posted this puzzle. I think it's time that I post a solution and make an announcement.

Code:
 r19\c58 Sashimi X-Wing/Skyscraper       <> 3    r7c8    extraneous

 r9c6    2-String Kite                   <> 3    r4c7

 <16+5>  XY-Wing  r4c7/r4c2+r6c8         <> 5    r4c8    extraneous

 r48c56  <39> UR Type 4                  <> 3    r48c5   extraneous

 <13+6>  XYZ-Wing r4c8/r1c8+r4c7         <> 6    r5c8    extraneous

 (3=9)r3c9 - r2c7 = (9-3)r5c7 = (3)r9c7  [gM-Wing ]   <> 3    r7c9
 +-----------------------------------------------------+
 |  5    8    9    |  4    36   1    |  7    36   2    |
 |  3    7    4    |  69   2    5    | b69   8    1    |
 |  6    2    1    |  39   8    7    |  5    4   a39   |
 |-----------------+-----------------+-----------------|
 |  4    56   2    |  8    159  39   |  16   136  7    |
 |  1    56   7    |  35   4    2    | c369  359  8    |
 |  8    9    3    |  157  157  6    |  2    15   4    |
 |-----------------+-----------------+-----------------|
 |  2    13   5    |  67   67   4    |  8    19   39   |
 |  7    13   8    |  135  159  39   |  4    2    6    |
 |  9    4    6    |  2    13   8    | d13   7    5    |
 +-----------------------------------------------------+
 # 37 eliminations remain

I have a number of puzzles where a gM-Wing is used to get around an XY-Chain. I now believe these puzzles are unreasonable to post. So, I'm going to delete them. However, puzzles where a W-Wing is used to get around an XY-Chain will still be fair game for posting.

Regards, Danny
Back to top
View user's profile Send private message
arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA

PostPosted: Sat Jan 23, 2010 2:58 pm    Post subject: Reply with quote

daj95376 wrote:
I have a number of puzzles where a gM-Wing is used to get around an XY-Chain. I now believe these puzzles are unreasonable to post. So, I'm going to delete them.
There is at least two more m-wings (another 39 and a 36) or short xy-chains that remove the 3 from r1c8 and solve the puzzle. I have just gotten to where I can spot them. Sorry to see them go. Sad
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Puzzles by daj 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