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oly_r
Joined: 21 May 2007
Posts: 4
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 Posted: Wed Oct 15, 2008 12:00 pm Post subject: Oct 15. I get to here. |
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I can get to this point and the hint shows 8 for r2c1, how do I get this. I admit I have read over the advanced step discriptions and don't understand them. Sorry if this is rehashing the same ole stuff but I really want to figure this out.
| Code: |
+---------------+-----------+-----------------+
| 6 79 179 | 5 2 3 | 4 189 1789 |
| 18 379 1379 | 6 89 4 | 1789 2 5 |
| 258 259 4 | 89 1 7 | 89 6 3 |
+---------------+-----------+-----------------+
| 15 6 159 | 4 7 8 | 2 3 19 |
| 7 8 159 | 3 59 2 | 6 159 4 |
| 3 4 2 | 1 6 59 | 589 7 89 |
+---------------+-----------+-----------------+
| 4 1 567 | 289 3 59 | 5789 589 26789 |
| 9 235 356 | 7 58 1 | 358 4 268 |
| 25 2357 8 | 29 4 6 | 13579 159 1279 |
+---------------+-----------+-----------------+
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Wed Oct 15, 2008 12:36 pm Post subject: |
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| Look at the pair of 89's in row 3. This removes the other 8's in row three leaving your clue as the only 8 left in box1. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Oct 15, 2008 3:31 pm Post subject: |
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| Quote: | | I admit I have read over the advanced step discriptions and don't understand them. |
Welcome to the forum. There are many sites with information about various techniques ranging from basic to extremely advanced. But don't hesitate to ask questions here. There are many people who will be more than happy to help out. |
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oly_r
Joined: 21 May 2007
Posts: 4
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| Posted: Wed Oct 15, 2008 4:48 pm Post subject: OOOOH |
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| Ok, i have to admit i didn't get it at first what you were saying, but that helps me a lot. THANKS. Is there a name for that? |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Oct 15, 2008 5:16 pm Post subject: Re: OOOOH |
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| oly_r wrote: | | Ok, i have to admit i didn't get it at first what you were saying, but that helps me a lot. THANKS. Is there a name for that? |
That particular situation with the 89s is called Naked Pairs. There are also naked triples, quads, etc., which fall under the general term of Subsets. The key is that "X" number of cells are restricted to possibilities for only "X" numbers.
Let's look at a triple for the numbers 123. The three cells could be 123-123-123 or 12-13-23 or 123-23-12 or any combination as long as those three numbers are the only possibilities in a row, column or box. Of course, that means all other 1s, 2s and 3s are removed from the other cells in that row, column or box.
Subsets, along with Locked Candidates, also known as Box-Line Interactions, are two basic techniques that need to be learned and used to clean up a grid in preparation for more advanced techniques.
On this site, those techniques are adequate to solve all but the Very Hards. |
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oly_r
Joined: 21 May 2007
Posts: 4
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| Posted: Thu Oct 16, 2008 1:17 pm Post subject: |
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I can't picture that as an abstract. I think this has the situation you describe in a couple places but don't see specifically how to use that process.
| Code: |
+---------------+-------------+-----------------+
| 4 3 78 | 12 6 127 | 58 9 2578 |
| 6 5 1 | 8 9 27 | 3 27 4 |
| 2 789 789 | 4 3 5 | 1 6 78 |
+---------------+-------------+-----------------+
| 39 149 23569 | 12 1247 8 | 4569 23457 257 |
| 7 48 2358 | 6 24 9 | 458 2345 1 |
| 89 1489 2689 | 5 1247 3 | 4689 247 278 |
+---------------+-------------+-----------------+
| 38 6 38 | 7 12 12 | 45 45 9 |
| 1 79 79 | 3 5 4 | 2 8 6 |
| 5 2 4 | 9 8 6 | 7 1 3 |
+---------------+-------------+-----------------+
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Play this puzzle online at the Daily Sudoku site |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Thu Oct 16, 2008 3:55 pm Post subject: |
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| oly_r wrote: | I can't picture that as an abstract. I think this has the situation you describe in a couple places but don't see specifically how to use that process.
| Code: |
+---------------+-------------+-----------------+
| 4 3 78 | 12 6 127 | 58 9 2578 |
| 6 5 1 | 8 9 27 | 3 27 4 |
| 2 789 789 | 4 3 5 | 1 6 78 |
+---------------+-------------+-----------------+
| 39 149 23569 | 12 1247 8 | 4569 23457 257 |
| 7 48 2358 | 6 24 9 | 458 2345 1 |
| 89 1489 2689 | 5 1247 3 | 4689 247 278 |
+---------------+-------------+-----------------+
| 38 6 38 | 7 12 12 | 45 45 9 |
| 1 79 79 | 3 5 4 | 2 8 6 |
| 5 2 4 | 9 8 6 | 7 1 3 |
+---------------+-------------+-----------------+
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Play this puzzle online at the Daily Sudoku site |
Check out column 3, rows 1-3-8. There is a naked triple 789. Those three cells have 789 as the only possibilities and those cells must be solved with 7-8-9 although we don't yet know which goes in which cell. But we do know that 789 can be removed from the other cells in that column.
There's also a 4-5-8 triple in column 7. |
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oly_r
Joined: 21 May 2007
Posts: 4
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| Posted: Fri Oct 17, 2008 4:29 pm Post subject: |
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| so from the 7,8,9 triple I can get that r7c3 is a 3 RIGHT? |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Fri Oct 17, 2008 4:49 pm Post subject: |
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| oly_r wrote: | | so from the 7,8,9 triple I can get that r7c3 is a 3 RIGHT? |
That is correct because no 7, 8 or 9 can exist in any cell in that column other than the three cells forming the triple. Of course, the 789 and now the 3 are removed from rows 456 in that column. |
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