The New Sudoku Players' Forum

[yzehavi]

I am blocked with this puzzle for some time.
Published at Haaretz (pappocom puzzles) on Aug 19 2013 .
I this puzzle unsolved ?

Code: Select all

|9b1|b5b|bbb|
|b8b|bb9|b2b|
|b5b|7b6|bbb|
|bbb|4bb|6bb|
|bb6|b9b|74b|
|bb4|6b2|bbb|
|bbb|5b8|b1b|
|b7b|9bb|b6b|
|bbb|b6b|3b4|


Thanks a lot.

Yoav.

[JasonLion]

Code: Select all

9.1.5.....8...9.2..5.7.6......4..6....6.9.74...46.2......5.8.1..7.9...6.....6.3.4

Are you familiar with the hidden pair technique? I was able to solve the puzzle using singles, locked candidates, and hidden pairs.

[ArkieTech]

Code: Select all

 *-----------------------------------------------------------------------------*
 | 9       46-23   1       | 238     5       34      | 48      378     3678    |
 | 3467    8       37      | 13      134     9       | 145     2       13567   |
 | 234     5       23      | 7       12348   6       | 1489    389     1389    |
 |-------------------------+-------------------------+-------------------------|
 | 123578  1239    235789  | 4       1378    1357    | 6       3589    123589  |
 | 12358   123     6       | 138     9       135     | 7       4       12358   |
 | 13578   139     4       | 6       1378    2       | 1589    3589    13589   |
 |-------------------------+-------------------------+-------------------------|
 | 2346    46-239  239     | 5       2347    8       | 29      1       279     |
 | 123458  7       2358    | 9       1234    134     | 258     6       258     |
 | 1258    129     2589    | 12      6       17      | 3       5789    4       |
 *-----------------------------------------------------------------------------*


4 and 6 occur in only two places in column 2. r1c2 and r7c2 must contain a 4 or 6 all other candidates in these cells can be removed.

Only singles remain

[yzehavi]

Code: Select all

9.1.5.....8...9.2..5.7.6......4..6....6.9.74...46.2......5.8.1..7.9...6.....6.3.4

Are you familiar with the hidden pair technique? I was able to solve the puzzle using singles, locked candidates, and hidden pairs.

Hi JasonLion,

It seems that even though I solve sudoku for about 10 years sometimes I'm blocked.
I wonder why ?

Can you link me to some white pappers on those techniques.

Yoav.

[yzehavi]

Hi Dan,

Now It's clear to me (colume 2 ).

I was focus on the upper middle block.

Code: Select all

|   28       5       34    |
|   13      134      9    |
|     7       28       6   |
 

Thnak you.

Yoav.

[JasonLion]

Sudopedia is a good place to start.