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 

No Rating: Puzzle #46 (from new set)

 
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: Sat Sep 13, 2008 4:55 am    Post subject: No Rating: Puzzle #46 (from new set) Reply with quote

Well, it seems that alternate paths easily reduce my puzzles. Here's the last one.

Code:
 +-----------------------+
 | . . . | . . . | . . 4 |
 | . 4 . | 2 5 . | 8 7 1 |
 | . . . | . . . | 3 . . |
 |-------+-------+-------|
 | . 8 . | . 2 . | 7 4 3 |
 | . 5 . | 8 3 . | 6 . . |
 | . . . | . . . | . . 8 |
 |-------+-------+-------|
 | . 6 7 | 3 4 . | . . . |
 | . 3 . | 1 . . | . . 5 |
 | 8 1 . | 6 . 5 | . 3 . |
 +-----------------------+   # DAJ 46
Back to top
View user's profile Send private message
keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Sat Sep 13, 2008 1:06 pm    Post subject: Reply with quote

Wow! Nice puzzle.

I'm going to try it again without the three UR's and a Bug+1.

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



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

PostPosted: Sat Sep 13, 2008 9:20 pm    Post subject: Reply with quote

I just couldn't find the key to this one. After three URs, an X-, XY- and XYZ-Wing, I was still stuck. I used my Medusa crutch and it quickly trapped a candidate which finished it off.
Back to top
View user's profile Send private message
tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

PostPosted: Sat Sep 13, 2008 9:56 pm    Post subject: Reply with quote

Marty R. wrote:
I just couldn't find the key to this one. After three URs, an X-, XY- and XYZ-Wing, I was still stuck. I used my Medusa crutch and it quickly trapped a candidate which finished it off.


Marty, I almost had your exact sequence but was able to achieve a BUG+1 situation to complete the puzzle. More specifically, I had a
Type 1 UR <24>
Type 3 UR <59>; x-wing <5>
Type 3 UR <78>; x-wing <8>
x-wing <9>
color on <9>; deleted r6c7
xy-wiing <679>; pivot r6c2
xyz-wing <369>; pivot r2c1
BUG+1; r6c6=7

Also, I recall a naked quad somewhere in the sequence.

I would not anticipate the single additional deletion by coloring to have been required but ...........

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



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

PostPosted: Sun Sep 14, 2008 12:30 am    Post subject: Reply with quote

tlanglet wrote:
Marty R. wrote:
I just couldn't find the key to this one. After three URs, an X-, XY- and XYZ-Wing, I was still stuck. I used my Medusa crutch and it quickly trapped a candidate which finished it off.


Marty, I almost had your exact sequence but was able to achieve a BUG+1 situation to complete the puzzle. More specifically, I had a
Type 1 UR <24>
Type 3 UR <59>; x-wing <5>
Type 3 UR <78>; x-wing <8>
x-wing <9>
color on <9>; deleted r6c7
xy-wiing <679>; pivot r6c2
xyz-wing <369>; pivot r2c1
BUG+1; r6c6=7

Also, I recall a naked quad somewhere in the sequence.

I would not anticipate the single additional deletion by coloring to have been required but ...........

Ted

Ted, the 59 and 78 URs were Type 4 on my grid. I didn't do the coloring and my XY-Wing was on 794. I suppose it's possible I had a BUG and missed it, but I'm not doing it again. The first time I was near the end when I spotted a duplicate number in a house and had to erase everything and start over, something that happens too often and brings out some choice words.
Back to top
View user's profile Send private message
daj95376



Joined: 23 Aug 2008
Posts: 3854

PostPosted: Sun Sep 14, 2008 1:23 am    Post subject: Reply with quote

Code:
   c7b9  Naked  Pair                     <> 24   [r1c7]
 r1      Naked  Quad                     <> 2579 [r1c1356]
   c1b1  Locked Candidate 1              <> 1    [r456c1]
   c247  Swordfish (332)                 <> 9    [r1c8],[r3c168],[r6c1368] + concurrent
 r248    Swordfish (332)                 <> 9    [r3c16],[r5c136],[r6c136]
   c6b5  Locked Candidate 1              <> 1    [r13c6]
 r6      Naked  Quad                     <> 4679 [r6c13]
 r5  b4  Locked Candidate 1              <> 4    [r5c6]
 r4  b4  Locked Candidate 1              <> 6    [r4c6]
         UR Type 1 [r89c37]              <> 24   [r8c3]
         XYZ-Wing [r2c1]/[r2c3]+[r4c1]   <> 6    [r1c1]
 r2  b1  Locked Candidate 1              <> 6    [r2c6]
   c1    Hidden Pair                     =  69   [r24c1]
         BUG+1                           =  7    [r6c6]
Back to top
View user's profile Send private message
keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Sun Sep 14, 2008 1:33 am    Post subject: Reply with quote

After basic basics:
Code:
+----------------------+----------------------+----------------------+
| 123679 279    58     | 79     1678   136789 | 59     259    4      |
| 369    4      369    | 2      5      369    | 8      7      1      |
| 1279   279    58     | 479    178    14789  | 3      259    6      |
+----------------------+----------------------+----------------------+
| 69     8      169    | 5      2      169    | 7      4      3      |
| 479    5      149    | 8      3      1479   | 6      19     2      |
| 234679 279    123469 | 479    167    14679  | 59     159    8      |
+----------------------+----------------------+----------------------+
| 5      6      7      | 3      4      2      | 1      8      9      |
| 249    3      249    | 1      78     78     | 24     6      5      |
| 8      1      24     | 6      9      5      | 24     3      7      |
+----------------------+----------------------+----------------------+
There is a quad in R1. If you go that route, there is then a swordfish on <9> in R248. Eventually, to here:
Code:
+-------------+-------------+-------------+
| 136 2   8   | 7   16  36  | 9   5   4   |
| 369 4   369 | 2   5   369 | 8   7   1   |
| 17  79  5   | 49  18  48  | 3   2   6   |
+-------------+-------------+-------------+
| 69  8   169 | 5   2   19  | 7   4   3   |
| 47  5   14  | 8   3   17  | 6   9   2   |
| 23  79  23  | 49  67  467 | 5   1   8   |
+-------------+-------------+-------------+
| 5   6   7   | 3   4   2   | 1   8   9   |
| 249 3   249 | 1   78  78  | 24  6   5   |
| 8   1   24  | 6   9   5   | 24  3   7   |
+-------------+-------------+-------------+
There are many chains, or a <24> Type 1 UR, leading to an XYZ-wing, and this BUG+1:
Code:
+-------------+-------------+-------------+
| 13  2   8   | 7   16  36  | 9   5   4   |
| 69  4   36  | 2   5   39  | 8   7   1   |
| 17  79  5   | 49  18  48  | 3   2   6   |
+-------------+-------------+-------------+
| 69  8   16  | 5   2   19  | 7   4   3   |
| 47  5   14  | 8   3   17  | 6   9   2   |
| 23  79  23  | 49  67  467 | 5   1   8   |
+-------------+-------------+-------------+
| 5   6   7   | 3   4   2   | 1   8   9   |
| 24  3   9   | 1   78  78  | 24  6   5   |
| 8   1   24  | 6   9   5   | 24  3   7   |
+-------------+-------------+-------------+
Keith
Back to top
View user's profile Send private message
Asellus



Joined: 05 Jun 2007
Posts: 865
Location: Sonoma County, CA, USA

PostPosted: Mon Sep 15, 2008 8:20 am    Post subject: Reply with quote

If you apply the 24 UR first, then there is a 9 X-Wing (rather than the Swordfish). After that, the puzzle can be solved with one more step: The 178 XY-Wing in r3 and c5 with the <7> r3c1 transported to r6c2 eliminates <7> from r6c5.
Back to top
View user's profile Send private message Visit poster's website
cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada

PostPosted: Mon Sep 15, 2008 4:24 pm    Post subject: Reply with quote

It didn't work for me. I found the easy <24> UR - then the quad in R1 - a powerful x-wing on <9> - then a series of xy-wings <479> <679> <479> again - then an xyz <369>. I must have eradicated the UR's and other solutions cos they're not there - I swear.
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