Comments on: Sudoku Techniques (Part 4) Box – Box interactions http://www.expertsudokusolver.com/sudoku-solver/easy-sudoku-techniques/sudoku-techniques-part-4-box-box-interactions/ Everything you need to help you become an expert sudoku solver. Mon, 14 Feb 2011 16:52:35 +0000 hourly 1 http://wordpress.org/?v=abc By: martinp http://www.expertsudokusolver.com/sudoku-solver/easy-sudoku-techniques/sudoku-techniques-part-4-box-box-interactions/comment-page-1/#comment-49 martinp Wed, 23 Sep 2009 22:11:30 +0000 http://www.expertsudokusolver.com/?p=59#comment-49 David, you have me there! I was so busy concentrating on showing the possibilities in boxes 7 and 8 and trying to make it fit the technique, that I completely forgot to say that it is a perfect example of a <a href="http://www.expertsudokusolver.com/sudoku-solver/intermediate-sudoku-techniques/sudoku-techniques-part-5-naked-pairs/" rel="nofollow">naked pair</a>. Good catch! David, you have me there! I was so busy concentrating on showing the possibilities in boxes 7 and 8 and trying to make it fit the technique, that I completely forgot to say that it is a perfect example of a naked pair. Good catch!

]]> By: David Forthoffer http://www.expertsudokusolver.com/sudoku-solver/easy-sudoku-techniques/sudoku-techniques-part-4-box-box-interactions/comment-page-1/#comment-48 David Forthoffer Wed, 16 Sep 2009 00:08:07 +0000 http://www.expertsudokusolver.com/?p=59#comment-48 This seems too complicated for me. By just looking at row 7, cell 7,2 must be 6 or 2. Similarly, cell 7,7 must be 6 or 2. Since cell 7,2 cannot be 6 (because of 2,2), cell 7,2 must be 2. So cell 7,7 must be 6. Maybe your example would have been clearer if you had not colored 8,2 or 9,2. This seems too complicated for me.

By just looking at row 7, cell 7,2 must be 6 or 2. Similarly, cell 7,7 must be 6 or 2.

Since cell 7,2 cannot be 6 (because of 2,2), cell 7,2 must be 2.

So cell 7,7 must be 6.

Maybe your example would have been clearer if you had not colored 8,2 or 9,2.

]]> By: martinp http://www.expertsudokusolver.com/sudoku-solver/easy-sudoku-techniques/sudoku-techniques-part-4-box-box-interactions/comment-page-1/#comment-47 martinp Thu, 27 Aug 2009 16:52:35 +0000 http://www.expertsudokusolver.com/?p=59#comment-47 Hi kz, Glad you are finding it useful. I need to check that you mean the cell references the same way I am using them. So, for me 9,2 means row 9 column 2 and that whole column is excluded because there is already a 6 in it (in 2,2). So, 7,8 is the far right gap in row 7 that I am looking at. Because the 6 must go in one of the two bottom rows in the bottom-left box (ie box 7) and must also be in the bottom two rows of box 8....there is nowhere else left for it in the final box and so it must go in 7,8. Does that help? Fire away if I am still not being clear. Martin Hi kz,

Glad you are finding it useful.

I need to check that you mean the cell references the same way I am using them. So, for me 9,2 means row 9 column 2 and that whole column is excluded because there is already a 6 in it (in 2,2).

So, 7,8 is the far right gap in row 7 that I am looking at. Because the 6 must go in one of the two bottom rows in the bottom-left box (ie box 7) and must also be in the bottom two rows of box 8….there is nowhere else left for it in the final box and so it must go in 7,8.

Does that help? Fire away if I am still not being clear.

Martin

]]> By: kz http://www.expertsudokusolver.com/sudoku-solver/easy-sudoku-techniques/sudoku-techniques-part-4-box-box-interactions/comment-page-1/#comment-46 kz Wed, 26 Aug 2009 19:25:43 +0000 http://www.expertsudokusolver.com/?p=59#comment-46 Thanks for these tips, Your final statement in this one throws me though. How did you determine 7,8 from the above? 6 would be in 9,2 but how do we know, yet, about squares 7 or 8? thanks Thanks for these tips, Your final statement in this one throws me though. How did you determine 7,8 from the above? 6 would be in 9,2 but how do we know, yet, about squares 7 or 8?
thanks

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