The New Sudoku Players' Forum

[jvs]

Could someone tell me what technique to use to take the next solution step in the following? Thanks in advance.

Code: Select all

569     1  69 |   8    2   34 | 49   7 356
3     689  78 |   5 4679   47 |  2 489   1
56789   2   4 | 369  679    1 | 89  35 356
--------------+---------------+-----------
4689    7   1 | 369 4689    2 |  5 349 349
2    3469 369 | 369 4569  345 |  7   1   8
489  3489   5 |   1 4789 3478 |  6   2 349
--------------+---------------+-----------
489   489  28 |   7    1   58 |  3   6 259
1      36  36 |   2   58    9 | 48 458   7
789     5 278 |   4    3    6 |  1  89  29


[Carcul]

Hi Jvs.

Here are some possible steps:

1. Locked candidates in box 3: in column 7 the candidate "9" is located only in box 3, therefore eliminate all others "9s" in this box - aliminate "9" from r1c9, r2c8, r3c8, and r3c9.

2. A naked triple then emerges in box 3.

3. Another naked triple emerges in row 8.

4. Locked candidates in box 7 - eliminate "4" from r7c9.

5. Locked candidates in column 9 - eliminate "4" from r4c8.

6. Two more naked triples and a naked pair (try to find these).

Good luck.

Regards, Carcul

[jvs]