Stuck on Times book 1 puzzle 88

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Stuck on Times book 1 puzzle 88

Postby Sabreman64 » Sat Jul 23, 2005 7:58 am

I'm completely stuck on puzzle 88 in Times book 1. This is as far as I've got:

xx1 43x xxx
xx4 x78 6x1
xx7 x51 9xx

486 795 123
713 824 569
952 x1x x7x

xx5 x4x x1x
3x9 182 xxx
1x8 567 39x

I've even resorted to filling in a large sudoku grid with all the possibilities in the empty cells, but it hasn't helped me. Could someone please give me a small hint as to which row, column, or box I should be looking at in order to solve the puzzle?
Sabreman64
 
Posts: 28
Joined: 22 July 2005

Re: Stuck on Times book 1 puzzle 88

Postby MCC » Sat Jul 23, 2005 4:11 pm

Sabreman64 wrote:I'm completely stuck on puzzle 88 in Times book 1. This is as far as I've got:

xx1 43x xxx
xx4 x78 6x1
xx7 x51 9xx

486 795 123
713 824 569
952 x1x x7x

xx5 x4x x1x
3x9 182 xxx
1x8 567 39x

I've even resorted to filling in a large sudoku grid with all the possibilities in the empty cells, but it hasn't helped me. Could someone please give me a small hint as to which row, column, or box I should be looking at in order to solve the puzzle?



Look at column 8, what number can only go in box 3.
This enables you to eliminate some candidates from box 3.
Then look at column 9, you can then place a number.
MCC
 
Posts: 1275
Joined: 08 June 2005

Postby Sabreman64 » Sat Jul 23, 2005 10:14 pm

Maybe it's because I'm tired or maybe I've not understood the clue you've given me, but I'm sorry, I'm still stuck. If I look at column 8 in box 3, I find the following possibilities: row 1: 5, 8; row 2: 3, 5; row 3: 3, 4, 8. Please forgive me if I'm being completely thick, but I can't see it.
Sabreman64
 
Posts: 28
Joined: 22 July 2005

Postby Sabreman64 » Sat Jul 23, 2005 10:52 pm

I feel really silly now, because I've just sussed it. After looking again at column 9, I found that 2 and 4 were the only possibilities in rows 3 and 9. So I could eliminate 2 and 4 as possibilities from the rest of column 9. It was staring me in the face all the time, and I didn't see it. Was that what you were hinting at, MCC?
Sabreman64
 
Posts: 28
Joined: 22 July 2005

Postby MCC » Sun Jul 24, 2005 1:13 pm

Sabreman64 wrote:I feel really silly now, because I've just sussed it. After looking again at column 9, I found that 2 and 4 were the only possibilities in rows 3 and 9. So I could eliminate 2 and 4 as possibilities from the rest of column 9. It was staring me in the face all the time, and I didn't see it. Was that what you were hinting at, MCC?


Yes.

Once you've realise that the 8 in box 3 can only go in column 8, you can eliminate all other 8's in box 3 leaving you with a naked double (2,4) in column 9. Then having eliminated all the other 2's and 4's in column 9 you can place an 8 in (r6c9).
MCC
 
Posts: 1275
Joined: 08 June 2005

Postby seamus » Fri Jul 29, 2005 4:48 pm

I love Sudoku - it's great for getting the brain going. But I'm still struggling with puzzle 88, and I haven't even got as far as sabreman64 ! This is what I've achieved -

xx1 4xx xxx
xx4 x78 6x1
xx7 x51 9xx

486 xxx x23
713 824 569
952 xxx xxx

xx5 x4x xxx
3x9 18x xxx
xx8 xx7 3xx

Am I missing something obvious? help please.
seamus
 
Posts: 2
Joined: 29 July 2005

Postby Animator » Fri Jul 29, 2005 5:31 pm

Can you check if you used the correct starting grid?

This grid has multiple solutions...

My best guess is that r6c8 has to be 7 (then you get a unqiue solution)...
Animator
 
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Joined: 08 April 2005

Postby seamus » Sat Jul 30, 2005 7:39 am

Oops !
Thank you Animator - I had missed a number in the grid. Thought I'd checked it properly, but I'm told this is a very frequent problem with newbies.
seamus
 
Posts: 2
Joined: 29 July 2005


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