The New Sudoku Players' Forum

[Fonzarelle]

To my understanding, the 7's in column 4, 5, and 9 form a swordfish. And when I tried to eliminate the 7 in column 3 row 2, I was alerted I made a mistake.

https://pasteboard.co/AyRSemC4rQZM.png

[Leren]

8...4216.12.6.584.4.6...25.649..3518781...6325321867942..36.9859....732636....471

Code: Select all

*----------------------------------------*
| 8 579 357 |*79    4     2   | 1 6 *379 |
| 1 2   37  | 6    *379   5   | 8 4 *379 |
| 4 79  6   |*789  *1379  189 | 2 5 *379 |
|-----------+-----------------+----------|
| 6 4   9   |*27   *27    3   | 5 1  8   |
| 7 8   1   | 59-4  59   a49  | 6 3  2   |
| 5 3   2   | 1     8     6   | 7 9  4   |
|-----------+-----------------+----------|
| 2 17  47  | 3     6     1-4 | 9 8  5   |
| 9 15  48  |c48    15    7   | 3 2  6   |
| 3 6   58  | 2589  259  b89  | 4 7  1   |
*----------------------------------------*

I've marked the 7's in Columns 4,5 & 9 with *'s and you can see that 4 rows 1234 are involved, so there is no Swordfish there.

An easy way to solve the puzzle from where you are is via an XY Wing in cells a,b & c, which shows that one of a or c must be 4, eliminates 4's in cells that they both see.

Leren