STUCK new with sudoku -- Washington Post (2008 jan 26)

Post the puzzle or solving technique that's causing you trouble and someone will help

STUCK new with sudoku -- Washington Post (2008 jan 26)

Postby franksg » Tue Jan 29, 2008 5:48 am

I work on Washington Post puzzles. This one from jan 26, 2008 was called hard. What I have so far is? Can you give me a hint where to go next. I've looked for hidden doubles, triples etc.

xxx x7x x6x
xx8 x4x xx2
xx1 23x 5xx

xx3 x12 xx5
x5x x8x x4x
9xx 35x 2xx

xx4 x21 7xx
8xx x9x 6xx
x7x x6x xxx
franksg
 
Posts: 2
Joined: 28 January 2008

Postby HATMAN » Tue Jan 29, 2008 12:28 pm

C3: r56 Hidden Pair 67
then naked pairs and singles
HATMAN
 
Posts: 204
Joined: 25 February 2006

re: Washington Post 2008.Jan.26

Postby Pat » Fri Feb 01, 2008 10:54 am

franksg wrote:I work on Washington Post puzzles

This one from jan 26, 2008 was called Hard

What I have so far is

Code: Select all
 . . . | . 7 . | . 6 .
 . . 8 | . 4 . | . . 2
 . . 1 | 2 3 . | 5 . .
-------+-------+------
 . . 3 | . 1 2 | . . 5
 . 5 . | . 8 . | . 4 .
 9 . . | 3 5 . | 2 . .
-------+-------+------
 . . 4 | . 2 1 | 7 . .
 8 . . | . 9 . | 6 . .
 . 7 . | . 6 . | . . .




as pointed out above,
it could be called a duo --
    in c3, the {6,7}
for a slightly different viewpoint,
consider it as line-to-box exclusions --
    the 6 for column 3 must be in box 4, exclude 6 elsewhere in that box

    the 7, ditto
-- then just "hidden singles"
User avatar
Pat
 
Posts: 3448
Joined: 18 July 2005


Return to Help with puzzles and solving techniques