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 11/05/30: B Advanced

 
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: Mon May 30, 2011 2:23 am    Post subject: Puzzle 11/05/30: B Advanced Reply with quote

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

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: Wed Jun 01, 2011 4:54 am    Post subject: Reply with quote

Too many moves for this classification of puzzle.

Multi-coloring; r1c2<>9
XYZ-Wing (249); r2c6<>9
Coloring; r5c2, r7c1<>7
W-Wing (49); r3c3<>4
XY-Wing (174), flightless with transport; r5c2<>4
Back to top
View user's profile Send private message
daj95376



Joined: 23 Aug 2008
Posts: 3854

PostPosted: Wed Jun 01, 2011 5:34 am    Post subject: Reply with quote

Marty,

Code:
 after basics
 +-----------------------------------------------------------------------+
 |  6      149    249    |  14     249    8      |  37     5      37     |
 |  12479  3      2479   |  5      249    149    |  8      49     6      |
 |  459    8      459    |  3      6      7      |  49     2      1      |
 |-----------------------+-----------------------+-----------------------|
 |  47     5      1      |  8      479    2      |  6      3      49     |
 |  479    479    6      |  47     1      3      |  5      8      2      |
 |  8      2      3      |  6      5      49     |  1      7      49     |
 |-----------------------+-----------------------+-----------------------|
 |  1479   6      479    |  2      3      5      |  479    149    8      |
 |  3      147    8      |  9      47     6      |  2      14     5      |
 |  25     479    25     |  147    8      14     |  3479   6      37     |
 +-----------------------------------------------------------------------+
 # 61 eliminations remain

Single-stepper(s):

Code:
 L-Wing: (1)r9c4 = r1c4 - r1c2 = (1-7)r8c2 = (7)r8c5  =>  r9c4<>7
 L-Wing: (1)r8c2 = r1c2 - r1c4 = (1-7)r9c4 = (7)r8c5  =>  r8c2<>7

 W-Wing: (4=1)r8c8 - r8c2 = r1c2 - r2c1 = r2c6 - (1=4)r9c6  =>  r8c5,r9c7<>4

Otherwise:

Code:
 r19c79  <37> UR Type 1.2224             <> 37   r9c7

 c38\r27 Sashimi X-Wing                  <> 9    r2c1   extraneous
 r39\c27 Sashimi X-Wing                  <> 9    r1c2

 c37r3   Skyscraper                      <> 4    r7c8,r9c2

 <49+7>  XY-Wing  r5c2/r5c4+r9c2         <> 7    r9c4

Note: the UR Type 1 cleans up a lot of "real estate" through additional basics.

Regards, Danny



AND ... I've been waiting for an opportunity to make a statement like this:

The W-Wing can be viewed as a flightless 2-String Kite with pincer extensions. _ Laughing _
Back to top
View user's profile Send private message
Marty R.



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

PostPosted: Wed Jun 01, 2011 4:50 pm    Post subject: Reply with quote

Seeing as we have different ideas of what a Kite is, I'd call the two-string kite with extensions Simple Coloring.

As to the 14 W-Wing, I can see that the two 14 cells are linked by three strong links, although my three SLs have different cells than what I see in your notation, which I don't understand.
Back to top
View user's profile Send private message
daj95376



Joined: 23 Aug 2008
Posts: 3854

PostPosted: Wed Jun 01, 2011 5:34 pm    Post subject: Reply with quote

Marty R. wrote:
Seeing as we have different ideas of what a Kite is, I'd call the two-string kite with extensions Simple Coloring.

As to the 14 W-Wing, I can see that the two 14 cells are linked by three strong links, although my three SLs have different cells than what I see in your notation, which I don't understand.

Code:
+-----------------------------------+
|  .  1  .  |  1  .  .  |  .  .  .  |
|  1  /  /  |  /  /  1  |  /  /  /  |
|  .  /  .  |  .  .  .  |  .  .  1  |
|-----------+-----------+-----------|
|  .  /  1  |  .  .  .  |  .  .  .  |
|  .  /  .  |  .  1  .  |  .  .  .  |
|  .  /  .  |  .  .  .  |  1  .  .  |
|-----------+-----------+-----------|
|  1  /  .  |  .  .  .  |  .  1  .  |
|  .  1  .  |  .  .  .  |  .  14 .  |
|  .  /  .  |  1  .  14 |  .  .  .  |
+-----------------------------------+

Whether you call it a Kite or a 2-String Kite (as I learned), there is a strong link on <1> in [r2] and [c2]. This would normally perform the elimination r8c6<>1, but <1> doesn't exist in r8c6. (Yes, there also happens to be a strong link on <1> in [b1], but that isn't of any consequence to the logic.)

Logic: pincer extensions on 2-String Kite -- strong links enclosed in parentheses ()

Code:
(r8c8<>4 r8c8=1) (r8c2<>1 r1c2=1) (r2c1<>1 r2c6=1) (r9c6<>1 r9c6=4)

                 | ------- 2-String Kite ------- |

Any cell that sees r8c8 and r9c6 can have <4> elminated.

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



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

PostPosted: Wed Jun 01, 2011 7:15 pm    Post subject: Reply with quote

Quote:
Whether you call it a Kite or a 2-String Kite

I don't call it either. I learned Kites as a perpendicular version of Skyscrapers which are weakly linked.

My Simple Coloring chain on 1 is:

R8c8, true
R8c2, false
R1c2, true
R1c4, false
R9c4, true
R9c6, false

My personal opinion is that if a move can be described with multiple techniques, then the simplest one should be used, which, in this case, is Simple Coloring in my humble opinion.

Cheers.
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