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Sudoku Puzzle

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t0
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27 Mar 2010, 5:53 pm

I have the following puzzle:

517 896 2??
??? 723 ??1
?8? 145 769

??1 437 6?2
?7? 612 49?
??? 958 317

7?4 561 ?2?
62? 3?9 1??
1?? 2?4 ??6

I'm wondering what the next step is and what's the logic behind it. I've already solved the puzzle using trial and error, but I'm not satisfied with that approach.



rmgh
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27 Mar 2010, 9:06 pm

http://quikk.se/?c9ee4
Green is the illogical instinct numbers and red are logical calculations.



rmgh
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27 Mar 2010, 9:14 pm

Don't you sometimes have to find a number that there are no immediate logical reason for? Like in chess, you have to think several moves ahead.



t0
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28 Mar 2010, 11:38 am

rmgh wrote:
Don't you sometimes have to find a number that there are no immediate logical reason for? Like in chess, you have to think several moves ahead.


I don't know if there are "rules" for building the puzzle. It just seems to reduce it to trial and error / depth-first searching, etc which seems odd for a puzzle that was originally paper/pencil based.