dailysudoku.com

[KT]

It's my first week of trying to solve Sudoku puzzles. I thought I was doing ok, until this one. The hint has baffled me

006 080 040
743 205 980
810 094 000

001 000 008
267 859 413
300 102 600

030 908 004
000 407 139
070 530 800

hint says r1c2=2 how come

2 can exist in r3c3, r8c2, r7c3,r8c3,r9c3

3x3 box3 has 5x 2 options

there are no unique rows,cols or box's

r1c1 (5,9), r1c2 (2,3,9), r3c3 (2,5)

Is there something with this pattern?

help please

KT

[KT]

Sorry typing error

last line should read r1c2 (2,5,9)

KT

[someone_somewhere]

What about this approch:

- - 6 - 8 - - 4 -
7 4 3 2 - 5 9 8 -
8 1 - - 9 4 - - -
- - 1 - - - - - 8
2 6 7 8 5 9 4 1 3
3 - - 1 - 2 6 - -
- 3 - 9 - 8 - - 4
- - - 4 - 7 1 3 9
- 7 - 5 3 - 8 - -

5 not in r7c1, it is in r8c1 or r8c2 or r8c3
5 not in r7c3, it is in r8c1 or r8c2 or r8c3
2 in r7c3 - unique cell
5 in r3c3 - unique cell
9 in r1c1 8 in r8c3 - unique cell
2 in r1c2 5 in r8c2 - unique cell

does it help you?

[KT]

Thanks. I'd missed something. These are quality puzzles aren't they!


What about this approch:

- - 6 - 8 - - 4 -
7 4 3 2 - 5 9 8 -
8 1 - - 9 4 - - -
- - 1 - - - - - 8
2 6 7 8 5 9 4 1 3
3 - - 1 - 2 6 - -
- 3 - 9 - 8 - - 4
- - - 4 - 7 1 3 9
- 7 - 5 3 - 8 - -

5 not in r7c1, it is in r8c1 or r8c2 or r8c3

(I'd missed the 5's that exist in r7 c7&8, so couldn't exist in r7,c1&3
so therefore no unique numbers

Thanks again KT



5 not in r7c3, it is in r8c1 or r8c2 or r8c3
2 in r7c3 - unique cell
5 in r3c3 - unique cell
9 in r1c1 8 in r8c3 - unique cell
2 in r1c2 5 in r8c2 - unique cell

does it help you?