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 

USA Today 15 May, 2015

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



Joined: 19 Sep 2005
Posts: 3344
Location: near Detroit, Michigan, USA

PostPosted: Mon Jun 01, 2015 10:00 pm    Post subject: USA Today 15 May, 2015 Reply with quote

So, here's a challenge:

No pencil marks?

Code:
Puzzle: USA051515
+-------+-------+-------+
| 4 . . | . 2 . | 6 . 8 |
| . . 5 | . 8 3 | . . . |
| . . . | . 4 . | . 5 9 |
+-------+-------+-------+
| . 5 7 | . 9 . | . . . |
| . . . | 4 3 6 | . . . |
| . . . | . 7 . | 3 1 . |
+-------+-------+-------+
| 7 4 . | . 1 . | . . . |
| . . . | 2 6 . | 7 . . |
| 1 . 9 | . 5 . | . . 3 |
+-------+-------+-------+

Keith
Back to top
View user's profile Send private message
keith



Joined: 19 Sep 2005
Posts: 3344
Location: near Detroit, Michigan, USA

PostPosted: Wed Jun 10, 2015 7:09 am    Post subject: Reply with quote

This is one of the toughest NAM (no advanced moves) puzzles I have seen. As has been noted, I am weird in that I think NAM puzzles should be done without pencil marks.

After singles:
Code:
+-------------------+-------------------+-------------------+
| 4     79    1     | 579   2     579   | 6     3     8     |
| 269   2679  5     | 1679  8     3     | 124   247   247   |
| 268   23678 2368  | 167   4     17    | 12    5     9     |
+-------------------+-------------------+-------------------+
| 3     5     7     | 18    9     128   | 248   2468  246   |
| 289   1     28    | 4     3     6     | 2589  2789  257   |
| 2689  2689  4     | 58    7     258   | 3     1     256   |
+-------------------+-------------------+-------------------+
| 7     4     268   | 3     1     89    | 2589  2689  256   |
| 5     38    38    | 2     6     489   | 7     489   1     |
| 1     268   9     | 78    5     478   | 248   2468  3     |
+-------------------+-------------------+-------------------+

Yes, you can do this without actually writing in the PMs. We are attacking C2.

There is a 38 pair in B7. R9C2 is 26.
Where is 9 in B6? There is a 28 pair in B4, so R6C2 is 269.
So, there is a pair 38 in C2, and R1C2 is 7 (because there is a triple 269 in C2).

Look at R2. R2C4 is not 9. R1C4 is 9 (in C4), and it is singles to the end.

Keith
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