I have a puzzle at the following position:
- Code: Select all
*-----------------------------------------------------------*
| 4 27 69 | 59 1 3 | 67 256 8 |
| 369 5 8 | 7 269 [269] | 1 236 4 |
| 1 27 36 | 58 268 4 | 9 236 57 |
|-------------------+-------------------+-------------------|
| 8 9 356 | 2 36 7 | 4 56 1 |
| 356 4 1 | 89 3689 69 | 2 7 35 |
| 7 36 2 | 4 5 1 | 36 8 9 |
|-------------------+-------------------+-------------------|
| 59 1 7 | 3 29 259 | 8 4 6 |
| 36 36 4 | 1 7 8 | 5 9 2 |
| 2 8 59 | 6 4 59 | 37 1 37 |
*-----------------------------------------------------------*
The "hint" in Simple Sudoku indicates that an exclusion can be made in cell r2c6 using Coloring. Well I've looked at the coloring maps of 2, 6, and 9 independently (see below), and I can't see it.
- Code: Select all
*-----------------------------------------------------------*
| . 2A . | . . . | . 2a . |
| . . . | . 2 2B | . 2 . |
| . 2a . | . 2 . | . 2 . |
|-------------------+-------------------+-------------------|
| . . . | . . . | . . . |
| . . . | . . . | . . . |
| . . . | . . . | . . . |
|-------------------+-------------------+-------------------|
| . . . | . 2B 2b | . . . |
| . . . | . . . | . . . |
| . . . | . . . | . . . |
*-----------------------------------------------------------*
*-----------------------------------------------------------*
| . . 6 | . . . | 6A 6 . |
| 6 . . | . 6 6B | . 6 . |
| . . 6 | . 6 . | . 6 . |
|-------------------+-------------------+-------------------|
| . . 6 | . 6 . | . 6A . |
| 6 . . | . 6 6b | . . . |
| . 6A . | . . . | 6a . . |
|-------------------+-------------------+-------------------|
| . . . | . . . | . . . |
| 6A 6a . | . . . | . . . |
| . . . | . . . | . . . |
*-----------------------------------------------------------*
*-----------------------------------------------------------*
| . . 9a | 9A . . | . . . |
| 9A . . | . 9 9 | . . . |
| . . . | . . . | . . . |
|-------------------+-------------------+-------------------|
| . . . | . . . | . . . |
| . . . | 9a 9 9 | . . . |
| . . . | . . . | . . . |
|-------------------+-------------------+-------------------|
| 9a . . | . 9 9 | . . . |
| . . . | . . . | . . . |
| . . 9A | . . 9a | . . . |
*-----------------------------------------------------------*
So, I basically have the following questions:
1) Am I missing something? Is there a coloring pattern (using only one candidate at a time) that can reveal the exclusion?
2) If not, what is the advanced coloring technique implied by the Simple Sudoko hint?
3) Is there some other human-usable pattern other than coloring that helps reduce the puzzle?
Let me know. Thanks.
Jeff