| Sartak
| | Joined: 06 Apr 2006 | | Posts: 3 | | : | |
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 Posted: Thu Apr 06, 2006 6:44 am Post subject: What did I just do here, with coloring? |
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I was solving my first extreme puzzle on Simple Sudoku and made it here:
| Code: | *-----------------------------------------------------------*
| 124 3 1247 | 9 15 8 | 1457 6 157 |
| 19 17 6 | 157 4 3 | 2 579 8 |
| 8 5 1479 | 17 6 2 | 147 3 179 |
|-------------------+-------------------+-------------------|
| 7 124 1459 | 3 159 6 | 15 8 1259 |
| 1569 126 3 | 15 8 7 | 156 4 1259 |
| 1569 8 159 | 2 159 4 | 1567 579 3 |
|-------------------+-------------------+-------------------|
| 1456 146 145 | 8 7 9 | 3 2 46 |
| 3 67 8 | 4 2 1 | 9 57 567 |
| 24 9 247 | 6 3 5 | 8 1 47 |
*-----------------------------------------------------------* |
I decided to use coloring on nines, to get this:
Fine, we can exclude the nine in R6C3, giving me:
I noticed that if the nines were truly green, then that would leave box five devoid of a nine. Thus, the nines are cyan, which quickly gave way to a solution by elementary methods. I wouldn't consider myself qualified to play puzzles of this difficulty (as stated, this was my *first* solved extreme in SS), as I don't know how to do swordfish, XY-wings, or practically anything more advanced than coloring.
Is this some new technique? Or is it one case of a more difficult technique? After solving it I went back and Simple Sudoku suggested I use multicoloring on sevens, like so:
I haven't grokked multicoloring yet, but surely it's more difficult than the technique I just used. |
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