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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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 Posted: Sun Nov 25, 2007 7:09 pm Post subject: "golden nugget" reference from the players forum |
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as if I didn't have other things to worry about in life  ... this thread was posted over at the players forum... I am not going to pretend I have any clue how to solve this monster, just wanted to make it public on this forum.
here is the thread:
http://www.sudoku.com/boards/viewtopic.php?t=5738
here is the grid:
| Code: | . . . | . . . | . 3 9
. . . | . . 1 | . . 5
. . 3 | . 5 . | 8 . .
-------+-------+------
. . 8 | . 9 . | . . 6
. 7 . | . . 2 | . . .
1 . . | 4 . . | . . .
-------+-------+------
. . 9 | . 8 . | . 5 .
. 2 . | . . . | 6 . .
4 . . | 7 . . | . . . |
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ravel
Joined: 21 Apr 2006
Posts: 536
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| Posted: Mon Nov 26, 2007 8:25 am Post subject: |
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Oh, no problem
| Code: | r6c5<>7(r5c5<>1,r6c6<>6,r6c2<>6,r4c2<>4,r1c7<>1),r2c5<>3,r8c5<>4(r8c3<>7,r1c3<>1,r1c4<>8),r7c9<>1,r3c4<>9,r8c6<>4,r7c1<>7,r1c7<>1
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Set r6c5 to 7 and continue with basics, as long as you can.
Then set r5c5 to 1 and continue, until you get a contradiction somewhere. Back to that position, now you can eliminate 1 from r5c5. Continue, until stuck again, then set r6c6 to 6 and so on.
With the contradiction for r1c7=1 you will get one (with r1c7<>1) that shows, that r6c5 cannot be 7.
The rest is even easier. |
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