The New Sudoku Players' Forum

[pontios999]

https://ibb.co/XJLqsZY

[Leren]

Code: Select all

*----------------------------------------------------------*
| 27   4      2379  | 35    359    8       | 1    25    6  |
| 168  5      138   | 136   36     2       | 4    9     7  |
| 126  129    129   | 7     4569   49-16   | 25   8     3  |
|-------------------+----------------------+---------------|
| 5    12789  6     | 4     237   $37      | 2379 1237  18 |
| 3    278    2478  | 9     1      5       | 6    247   48 |
| 127  1279   12479 | 236   8     $367     | 2379 12347 5  |
|-------------------+----------------------+---------------|
|*178 *1378   5     |*13    49-37   49-137 |*378  6     2  |
| 4    123678 1278  | 12356 23567 $1367    | 3578 1357  9  |
| 9    12367  127   | 8     23567 $1367    | 357  13457 14 |
*----------------------------------------------------------*

A couple of naked quads. The first is 1378 in Row 8 Cells marked *. The second is 1367 in column 6 cells marked $.

Leren

[pontios999]

Thanks! Didn't know that there are quads!

[Leren]

Read about Naked Quads here. Leren

[Pat]

quads are important...

but r7 has "hidden" pair

likewise c6