Triple confusion 2nd try

Advanced methods and approaches for solving Sudoku puzzles

Triple confusion 2nd try

Postby weesleekit2 » Thu Oct 06, 2005 6:29 pm

5**|***|**3
*8*|5*6|*4*
**6|*1*|2*5
-----------
*7*|*8*|*5*
**8|***|1**
*9*|*2*|*3*
-----------
**7|*6*|3**
*6*|2*8|*9*
9**|***|**4

Can a triple be identified by inspection when there is more than one possibility?

In row 1: the triple is col 4-78, col 7-678, col 8-678, not the 479 combination.
In row 3: the triple is col 1-37, col 4-378 and col 7-78, not the 479 combination.
In column 2: the triple is row 5-235, row 7-25, row 9-235, not the 125 combination.

I can’t figure out how to select the right one.

If this has been covered before please direct me.

This is my second post to the forum ... My fingers are crossed in hopes it’s better than the first one I sent last night.
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Postby PaulIQ164 » Thu Oct 06, 2005 6:54 pm

Sorry, I can't see the triples you're pointing out. Either I'm being dim (entirely possible), or else you've not quite understood what a 'triple' is.

But in answer to your question: if you've found more than one triple, there's no need to pick one - use them all!
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Postby tso » Thu Oct 06, 2005 7:26 pm

You do not understand what a triple is.

Your puzzle does not require them to be solved.

First, NAKED TRIPLES and HIDDEN TRIPLES are two different things.

Here are some good explanations of both, as well all other basic and intermediate tactics:

http://www.angusj.com/sudoku/hints.php
http://www.simes.clara.co.uk/programs/sudokutechniques.htm
http://www.palmsudoku.com/pages/techniques-overview.php


In short:

NAKED TRIPLE

Here are four examples of a naked triple:

Code: Select all
a) [123456][123][123][123]
b) [123456][123][123][ 12]
c) [123456][123][ 13][ 12]
d) [123456][ 23][ 13][ 12]


In each case, we have four cells in a row. Cells 2, 3 and 4 form a NAKED TRIPLE. Since the digits 1, 2 and 3 are the only ones that can fill these three cells, you may remove the digits 1, 2 and 3 from all other cells in the row, in this case, leaving [456] in the first cell.


HIDDEN TRIPLE

[12345][12367][12389][456][567][678][789][894][459]

In this case, the digits 1, 2 and 3 EACH appear in the first three cells and NO WHERE ELSE. They MUST be the numbers that fill these cells in some order, so the other candidates from ONLY those three cells are removed:

[123][123][123][456][567][678][789][894][459]
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Postby MCC » Fri Oct 07, 2005 2:13 pm

weesleekit2

To be going on with.
There is a single number placement in box 2.

There is a single number placement in box 7.
Which gives a naked pair in box 9.

The 6's are locked in column 9 in box 6.


By all means check out the links tso mentioned so you'll have an idea what a triplet is.
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Reliance

Postby basin446 » Sun Oct 09, 2005 10:23 am



Please tell me how that is relivat to any of this.
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Re: Reliance

Postby MCC » Sun Oct 09, 2005 12:17 pm

basin446 wrote:


Please tell me how that is relivat to any of this.


?

Can you repost your question.
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