The New Sudoku Players' Forum

[gmax]

Help please. The puzzle was labeled "Beware! Very Challenging!".
Can anyone provide a tip on how to proceed?
Thanks, in advance.

Code: Select all

-------------------------------------------
16  48  9 | 12467 468 2478 | 3    456 12568
7   48  2 | 5     3   9    | 168  46  16   
16  3   5 | 1246  468 248  | 7    9   1268
----------+----------------+---------------
9   1   7 | 26    568 28   | 4    3   56   
3   5   6 | 47    1   47   | 2    8   9   
8   2   4 | 3     9   56   | 56   1   7   
----------+----------------+---------------
2   7   1 | 469   456 3    | 5689 56  568 
5   9   3 | 8     7   16   | 16   2   4   
4   6   8 | 19    2   15   | 159  7   3   
-------------------------------------------


[Hud]

1 can't go in R2C7 due to locked candidates in box 9.

[TKiel]

1 also must be excluded from r9c4 due to box-line interaction (locked candidates) in box 2, which leaves that cell, and the rest, as a single.

Tracy

[gmax]

Your tips have given me a new a new level of insight.
Thank you!