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Is it solvable?

 
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caterinaleo



Joined: 17 Apr 2011
Posts: 4
PostPosted: Sun Apr 17, 2011 3:15 pm    Post subject: Is it solvable? Reply with quote
online tools appear stumped - as am I - can anyone tell me next step w/out guessing?

?517???23
??2?3?8??
?8?29??41
??89631?4
????7????
1?65???3?
81?32946?
??485731?
?3?614?8?

This is from Revenge Of the Ninja Sudoku, #171, Frank Longo.

oh - r4 c1,2 must be 2 removing 2 from rest of box. I cannot find how that helps me though. Hoping someone can give me hint w/ logic for next step. Thanks.
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Pat



Joined: 23 Feb 2010
Posts: 207
PostPosted: Sun Apr 17, 2011 3:25 pm    Post subject: Reply with quote
caterinaleo wrote:
online tools appear stumped - as am I - can anyone tell me next step w/out guessing?

Code:


 . 5 1 | 7 . . | . 2 3
 . . 2 | . 3 . | 8 . .
 . 8 . | 2 9 . | . 4 1
-------+-------+------
 . . 8 | 9 6 3 | 1 . 4
 . . . | . 7 . | . . .
 1 . 6 | 5 . . | . 3 .
-------+-------+------
 8 1 . | 3 2 9 | 4 6 .
 . . 4 | 8 5 7 | 3 1 .
 . 3 . | 6 1 4 | . 8 .


This is from Revenge Of the Ninja Sudoku, #171, Frank Longo.

oh - r4 c1,2 must be 2 removing 2 from rest of box. I cannot find how that helps me though.

Hoping someone can give me hint w/ logic for next step.

the 2 does help --
creates in r5 a "hidden" trio {2,6,8}

which solves the 1 for that row
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kuskey



Joined: 10 Dec 2008
Posts: 141
Location: Pembroke, NH
PostPosted: Sun Apr 17, 2011 5:20 pm    Post subject: is it solvable? Reply with quote
The hidden triple 268 is, in fact, the key to the solution. This sets r5c6<>1, r5c7<>59, and r5c9<>59 which reveals the naked pair 28 in c6. This sets r6c5<>8 and you are off and running to the solution.
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caterinaleo



Joined: 17 Apr 2011
Posts: 4
PostPosted: Mon Apr 18, 2011 12:08 am    Post subject: Reply with quote
Thank you Pat!
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