View previous topic :: View next topic 
Author 
Message 
JohnInOregon
Joined: 02 Aug 2006 Posts: 1

Posted: Wed Aug 02, 2006 10:47 pm Post subject: 7/31/06 puzzle; explanation of the hint. 


I have a question about the 7/31/06 puzzle. I apply simple
methods and fill in 11 entries, but then get stumped. The 'Hint'
function of Draw/Play says that for row 7, column 6 (counting from
the top left) the entry has to be 9. Can anyone tell me why?
The puzzle at the point where I am stumped is as follows:
7bbbb2bbb
bb497bb12
b82bbbb4b
625b941bb
873b2b954
bbb75b62b
b3bbb?26b
29bb87435
bbb2bbbb1
'b' stands for blank and I have put a '?' where the hint
says it must be a '9'. This puzzle is rated hard, but before and
after this single entry it is easy.
Thanks for the hint explanation.
John 

Back to top 


David Bryant
Joined: 29 Jul 2005 Posts: 559 Location: Denver, Colorado

Posted: Wed Aug 02, 2006 11:07 pm Post subject: Naked triplet {1, 4, 5} in row 7 


Hi, John! Which part of Oregon?
The short answer is that there's a naked triplet {1, 4, 5} in r7c145, so that "9" becomes the sole candidate at r7c6. That may be Greek to you, so let me explain.
 The only values that can possibly fit at r7c6 are, apparently, {1, 5, 9}; you can see this by simply counting the possibilities.
 Similarly, the only possibilites at r7c1 are {1, 4, 5}. At r7c4 the possibilities are also {1, 4, 5}. And at r7c5 the possibilities are {1, 4}.
 A moment's reflection will convince you that the three values {1, 4, 5} must fit in the three cells r7c1, r7c4, & r7c5 in some order. Therefore none of these values can possibly fit anywhere else in row 7, so the only possibility at r7c6 is "9". dcb 

Back to top 


Rick Kent
Joined: 03 Aug 2006 Posts: 2

Posted: Thu Aug 03, 2006 12:06 am Post subject: 7/31/06 puzzle rated "hard" or "very hard&quo 


Is this puzzle rated "hard" or "very hard"?
This puzzle is initially rated as "Hard" but when I press the "Grade" button on the initial puzzle, it changes the difficulty rating to "very hard".
Why would that be?
 Rick. 

Back to top 




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
