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3-25-05 Puzzle

 
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igolf4birdies



Joined: 01 Feb 2006
Posts: 4
Location: Russell Springs, KY

PostPosted: Thu Feb 16, 2006 9:09 pm    Post subject: 3-25-05 Puzzle Reply with quote

I had printed out some older puzzles to work and have gotten stuck on this one. It is rated as "hard" but I must be missing something. It seems "very hard" to me.

Can someone please give me some logic. Here is where I am.

8 _ 7 _ 2 5 3 9 1
2 1 _ _ _ 3 4 5 8
_ 5 3 _ _ _ 7 6 2
_ _ _ 5 1 _ _ _ 7
1 _ _ _ 4 _ _ _ 9
7 _ _ _ 3 8 _ _ _
5 9 _ _ _ _ _ 8 3
_ _ 2 3 _ _ _ _ _
3 _ 1 _ 5 _ 9 _ 4

I have found (7,8) pair in r8c2 and r9c2 and a (5,8) pair in r5c3 and r5c7. But stuck from there.

Thanks in advance.
Rick
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David Bryant



Joined: 29 Jul 2005
Posts: 559
Location: Denver, Colorado

PostPosted: Fri Feb 17, 2006 12:29 am    Post subject: Look at bottom center 3x3 box Reply with quote

Hi, Rick!

You need to concentrate on the bottom center 3x3 box, and on row 9 in particular.

-- You have already found a "hidden pair" {7, 8} in r7c2 & r9c2. So there can't be a "6" at r9c2.

-- There can't be a "6" at r9c8 either, because of the "6" at r3c8.

-- So the "6" in row 9 must lie in the bottom center 3x3 box, at r9c4 or at r9c6, and you can eliminate "6" from the other empty cells in the bottom center 3x3 box.

-- In particular this means that r7c5 = 7 -- that should get you rolling again. dcb Smile
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