| View previous topic :: View next topic |
| Author |
Message |
Don Odone
Joined: 18 Aug 2006
Posts: 2
|
 Posted: Sat Aug 19, 2006 4:37 pm Post subject: logic |
 |
|
| How does the naked triple work? |
|
| Back to top |
|
 |
TKiel
Joined: 22 Feb 2006
Posts: 292
Location: Kalamazoo, MI
|
| Posted: Sat Aug 19, 2006 5:04 pm Post subject: |
|
|
Don,
You should have posted this in the same thread as your original question, to make it easier for others to follow. Just click on the 'post reply' button at the bottom under the last post.
Look at column 2 in the puzzle.
| Code: |
*---------------------------------------------------------------------------*
| 14579 57 2 | 8 6 39 | 3579 4579 3479 |
| 45679 567 4567 | 1 2349 239 | 35679 8 234679 |
| 46789 3 4678 | 2479 249 5 | 1 2479 24679 |
|-----------------------+-------------------------+-------------------------|
| 3 25678 5678 | 269 289 269 | 4 1 26789 |
| 268 4 68 | 5 1289 7 | 689 3 2689 |
| 2678 9 1 | 246 2348 236 | 678 27 5 |
|-----------------------+-------------------------+-------------------------|
| 24578 2578 9 | 3 125 12 | 578 6 1478 |
| 25678 1 35678 | 269 259 4 | 35789 579 3789 |
| 456 56 3456 | 69 7 8 | 2 459 1349 |
*---------------------------------------------------------------------------*
|
You'll notice that r1c2, r2c2 & r9c2 contain only the digits (5,6 & 7). One of these cells must be 5, one must be 6 and one must be 7. You don't know which digit goes in what cell but those three cells must contain one of those three numbers. Therefore no other cells in that column can contain any of those three digits and they can be excluded from all other cells in that column. |
|
| Back to top |
|
|
Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
|
| Posted: Sat Aug 19, 2006 5:13 pm Post subject: Re: logic |
|
|
| Don Odone wrote: | | How does the naked triple work? |
It involves three numbers that can occupy only three cells in a row, column or box, though you don't know which number goes in which cell. Let's use 123 as an example.
Three cells contain only 123 in some combination. The three cells could be 123-123-123 or 12-123-123 or 12-13-23 or any combination of 123. These three cells cannot contain any number other than the 123 and none of 123 can go in any other cell.
The value lies in the fact that since 123 must go in those three cells in some combination, 123 can be eliminated as possibilities from all other cells in that row, column or box. Eliminating those possibilities can open up many other possibilities, including the direct solving of a cell.
The same principle applies to a naked pair, quad, etc.
Hope this makes sense.
P.S. I wrote this out not being aware of Tracy's post. |
|
| Back to top |
|
|
TKiel
Joined: 22 Feb 2006
Posts: 292
Location: Kalamazoo, MI
|
| Posted: Sat Aug 19, 2006 10:48 pm Post subject: |
|
|
| You did a more thorough job than I did. |
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
