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 

daily telegraph 3/7/08

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



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Sun Mar 09, 2008 12:05 am    Post subject: daily telegraph 3/7/08 Reply with quote
Code:
.3.|..9|...
.4.|.12|.6.
9.7|3..|...
---+---+---
..1|.2.|...
3.2|...|4.8
...|.4.|3..
---+---+---
...|..4|5.7
.6.|93.|.2.
...|8..|.3.


the grid I have after basics is a BUG in r1c7
Back to top
View user's profile Send private message
nataraj



Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
PostPosted: Sun Mar 09, 2008 12:23 pm    Post subject: Reply with quote
Right, Norm, that's a BUG+1 with "8" as the odd one out in r1c7.

Code:

+--------------------------+--------------------------+--------------------------+
| 12      3       6        | 4       58      9        | 278     78      15       |
| 58      4       58       | 7       1       2        | 9       6       3        |
| 9       12      7        | 3       58      6        | 28      4       15       |
+--------------------------+--------------------------+--------------------------+
| 4       8       1        | 5       2       3        | 67      79      69       |
| 3       5       2        | 6       9       7        | 4       1       8        |
| 6       7       9        | 1       4       8        | 3       5       2        |
+--------------------------+--------------------------+--------------------------+
| 18      19      3        | 2       6       4        | 5       89      7        |
| 7       6       58       | 9       3       15       | 18      2       4        |
| 25      29      4        | 8       7       15       | 16      3       69       |
+--------------------------+--------------------------+--------------------------+

I must have missed something cause I did not arrive at that BUG+1 when I did it with PnP but used a flightless xy-wing + transport to solve the puzzle:

12-28-18 (row 3, col 7) is an xy-wing that doesn't do anything.
But transporting the 1 in r3c2 via r1c1,r9c1 to r9c6 lets us eliminate 1 from r8c6 and r9c7

Tthe xy-wing basically says that if r8c7 is not 1 then r3c2 is 1.

The transport continues with "if r3c2=1 then r1c1=2 then r9c1=5 then r9c6=1"

The "1"s in r9c6 and r8c7 act as pincers like in a regular xy-wing.
Back to top
View user's profile Send private message Send e-mail Visit poster's website
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