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dl
Joined: 18 Dec 2008
Posts: 4
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 Posted: Tue Jul 28, 2009 6:30 am Post subject: stuck |
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I'm stuck at this point:
| Code: |
+-------+-------+-------+
| 2 . . | . 3 . | 1 6 7 |
| 5 . . | 6 . . | 8 . . |
| . 1 6 | . . . | 3 . 5 |
+-------+-------+-------+
| . 7 4 | . . 3 | 2 . 8 |
| . 5 . | . . 8 | 4 . . |
| . . . | . 4 . | 9 . . |
+-------+-------+-------+
| . 2 . | 4 . 9 | 5 8 1 |
| 1 . . | . . . | 6 . . |
| 4 . . | . . . | 7 . . |
+-------+-------+-------+
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[url=http://www.dailysudoku.com/sudoku/play.shtml?p=2:0:0:0:3:0:1:6:7:5:0:0:6:0:0:8:0:0:0:1:6:0:0:0:3:0:5:0:7:4:0:0:3:2:0:8:0:5:0:0:0:8:4:0:0:0:0:0:0:4:0:9:0:0:0:2:0:4:0:9:5:8:1:1:0:0:0:0:0:6:0:0:4:0:0:0:0:0:7:0:0:]
Can someone explain the next step? |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Tue Jul 28, 2009 6:47 am Post subject: |
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| Code: | .---------------------.---------------------.---------------------.
| 2 489 89 | 589 3 45 | 1 6 7 |
| 5 349 379 | 6 1279 1247 | 8 249 249 |
| 789 1 6 | 2789 2789 247 | 3 249 5 |
:---------------------+---------------------+---------------------:
| 69 7 4 | 159 1569 3 | 2 15 8 |
| 369 5 1239 | 1279 12679 8 | 4 1-37 *36 |
| 368 368 1238 | 1257 4 12567 | 9 1-357 *36 |
:---------------------+---------------------+---------------------:
| 367 2 37 | 4 67 9 | 5 8 1 |
| 1 389 35789 | 23578 2578 257 | 6 2349 2-349 |
| 4 3689 3589 | 12358 12568 1256 | 7 239 2-39 |
'---------------------'---------------------'---------------------' |
naked pair {3,6} marked in the grid in column 9 this removes all other 3's and 6's in column 9 and box 6
| Code: | .---------------------.---------------------.---------------------.
| 2 489 89 | 589 3 45 | 1 6 7 |
| 5 349 379 | 6 1279 1247 | 8 249 249 |
| 789 1 6 | 2789 2789 247 | 3 249 5 |
:---------------------+---------------------+---------------------:
| 69 7 4 | 159 1569 3 | 2 15 8 |
| 369 5 1239 | 1279 12679 8 | 4 17 36 |
| 368 368 1238 | 1257 4 12567 | 9 157 36 |
:---------------------+---------------------+---------------------:
|*367 2 *37 | 4 67 9 | 5 8 1 |
| 1 -389 -35789 | 23578 2578 257 | 6 2349 249 |
| 4 -3689 -3589 | 12358 12568 1256 | 7 239 29 |
'---------------------'---------------------'---------------------' |
3's are locked into row 7 of box 7 removing the other 3's in box 7
| Code: | .---------------------.---------------------.---------------------.
| 2 489 89 | 589 3 45 | 1 6 7 |
| 5 349 379 | 6 1279 1247 | 8 249 249 |
| 789 1 6 | 2789 2789 247 | 3 249 5 |
:---------------------+---------------------+---------------------:
| 69 7 4 | 159 1569 3 | 2 15 8 |
| 369 5 1239 | 1279 12679 8 | 4 17 36 |
|*368 *368 12-38 | 1257 4 125-67 | 9 157 *36 |
:---------------------+---------------------+---------------------:
| 367 2 37 | 4 67 9 | 5 8 1 |
| 1 89 5789 | 23578 2578 257 | 6 2349 249 |
| 4 689 589 | 12358 12568 1256 | 7 239 29 |
'---------------------'---------------------'---------------------' |
naked triple in row 6 {368} removes all other 3,6,8 from that row
finally you can place 6 in r9c6 !!
that is your first move |
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dl
Joined: 18 Dec 2008
Posts: 4
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| Posted: Tue Jul 28, 2009 1:17 pm Post subject: |
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| Thanks! |
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