The New Sudoku Players' Forum

[Wolfgang]

Just for fun (and to be the first one), i may introduce to you the double turbot technique.
Suppose you have the following in the boxes 1 and 2, where '*' means, there may be any candidates (also 3).

Code: Select all

16  *   *  | *  36  14 |
25  *  1256| 45  *  23 |
 * 123 1256| *   *   * |


Then r3c2 is 3.

To clarify the technique, this is the beginners version:

Code: Select all

15  *   *  | 12  45  * |
 *  *   24 | 12  45  * |
45 123  *  |  *  *   * |


I leave it up to you to classify all the variations of this fabulous technique

[Jeff]

Can you explain a bit more? Why do you call this double turbot? Has it got something to do with turbot fish?

[stuartn]

Look at the chains from [2,5] in R2C1

[Wolfgang]

Thanks, thats where the name is from, but i think, for the next step i have to change it: we drop box 2.

Code: Select all

16  *   *  |
25  *  1256|
 * 123 1256|


Then r3c2 is 3.

[Wolfgang]

Thanks, thats where the name is from, but i think, for the next step i have to change it: we drop box 2.

Code: Select all

16  *   *  |
25  *  1256|
 * 123 1256|


Then r3c2 is 3 (the name is quad - badly constructed sample).