## i need help

Advanced methods and approaches for solving Sudoku puzzles

### i need help

hi!
i'm stuck in this "very hard" level puzzle:

030 200 781
008 000 304
074 030 960

000 180 607
017 609 038
800 375 149

041 060 890
700 000 410
980 413 070

"0" is for a blank cell

any clue?
Thanks
pedro
(pt)
berbusco

Posts: 3
Joined: 19 July 2005

There's an interaction between blocks 4 and 7 that allow a candidate elimination (Look at the digit 6), then a pair in row 2.
Last edited by simes on Sun Dec 11, 2011 9:32 am, edited 1 time in total.
simes

Posts: 324
Joined: 11 March 2005
Location: UK

Thanks Simes
berbusco

Posts: 3
Joined: 19 July 2005

simes wrote:There's an interaction between blocks 4 and 7 that allow a candidate elimination (Look at the digit 6)

?? for me it is the xwing in cols 1 and 6
Wolfgang

Posts: 208
Joined: 22 June 2005

There's more than one way to skin a cat... or solve a Sudoku.
Last edited by simes on Sun Dec 11, 2011 9:32 am, edited 1 time in total.
simes

Posts: 324
Joined: 11 March 2005
Location: UK

The hidden pair in row 2 was enough to complete the puzzle.

Thanks again
berbusco

Posts: 3
Joined: 19 July 2005

berbusco wrote:The hidden pair in row 2 was enough to complete the puzzle.

I'm not sure whether you're agreeing with me or not!

The hidden pair (1 and 6) in row 2 is only available after the elimination of 6 as a candidate for (2,2) resulting from the consideration of 6 in blocks 4 and 7.
simes

Posts: 324
Joined: 11 March 2005
Location: UK