Help with USA Today puzzle from 5/22

Post the puzzle or solving technique that's causing you trouble and someone will help

Help with USA Today puzzle from 5/22

I'm so glad to have found this forum that doesn't speak "fish-ese" so I've just joined. I would appreciate a push in the right direction on this.

I can usually do sudokus. I can certainly do USA Today four star ones. But this one has me truly stuck, and although I've asked other friends, they're stumped too. Heres the original puzzle:

Code: Select all
`. . . | . 4 8 | 9 . 2. . . | . 6 . | . 5 .. . . | 1 . . | 7 6 .------+-------+------. 1 . | 2 8 . | . . 3. . 3 | . 1 . | 8 . .2 . . | . 7 4 | . 1 .------+-------+------. 3 8 | . . 2 | . . .. 9 . | . 3 . | . . .6 . 1 | 8 5 . | . . .`

Here's how far I've got:

Code: Select all
`1      567  567    |  57   4  8    |  9     3   234789  47   2      |  79   6  39   |  14    5   14834589  45   459    |  1    2  359  |  7     6   48-------------------+---------------+----------------4579   1    45679  |  2    8  569  |  456   49  3459    456  3      |  569  1  569  |  8     2   72      8    569    |  3    7  4    |  56    1   569-------------------+---------------+----------------45     3    8      |  46   9  2    |  1456  7   1456457    9    457    |  46   3  1    |  2     8   4566      2    1      |  8    5  7    |  3     49  49`

I know for sure my big numbers are correct. I just need a breakthrough of some sort to carry on, but I can't see a thing. What am I missing?

lightningbug

Posts: 4
Joined: 28 May 2008

Lightningbug,

Do you see the two cells with candidates 4 and 9 in row 9 columns 8 and 9? These two cells will have to wind up being either a 4 or a 9 so all other 4's and 9's can be removed from the lower right box.

dan
dan

ArkieTech

Posts: 2627
Joined: 29 May 2006
Location: NW Arkansas USA

Re: Help with USA Today puzzle from 5/22

lightningbug wrote:I know for sure my big numbers are correct. I just need a breakthrough of some sort to carry on, but I can't see a thing. What am I missing?

Well, you missed 2x Naked Pair, a Locked Candidate 1, and a Locked Candidate 2. You should have found those. That still leaves a Naked Quad to finish up before a bunch of Singles.
daj95376
2014 Supporter

Posts: 2624
Joined: 15 May 2006

I'm a clot

Thanks for the advice. Unfortunately, idiot that I am, I pressed spacebar before copying the puzzle, and got all the possiblities, not my own notations. THIS is actually how far I am:

Code: Select all
`1      567  56     |  57   4  8    |  9     3   2 3489   47   2      |  79   6  39   |  14    5   148 34589  45   459    |  1    2  359  |  7     6   48 -------------------+---------------+---------------- 579    1    5679   |  2    8  569  |  456   49  3 459    456  3      |  59   1  569  |  8     2   7 2      8    569    |  3    7  4    |  56    1   569 -------------------+---------------+---------------- 45     3    8      |  46   9  2    |  156   7  156 457    9    457    |  46   3  1    |  2     8   56 6      2    1      |  8    5  7    |  3     49  49`

So thanks for the help daj, but I did get that. I'm still stuck past that.

And thank you for the help Arkie, but although I have been doing sudokus for over a year now, I don't know a naked, amorous pair from a modestly clothed platonic one because I don't understand the jargon!

Sorry for the extra trouble.
lightningbug

Posts: 4
Joined: 28 May 2008

Re: Help with USA Today puzzle from 5/22

lightningbug wrote:".... been doing sudokus for over a year now, I don't know a naked, amorous pair from a modestly clothed platonic one because I don't understand the jargon..."

Hi lightningbug,
I think you'll find the following link will explain these things for you.
http://www.angusj.com/sudoku/hints.php

Cec
Cec

Posts: 1039
Joined: 16 June 2005

Re: Help with USA Today puzzle from 5/22

daj95376 wrote:That still leaves a Naked Quad to finish up before a bunch of Singles.

lightningbug wrote:So thanks for the help daj, but I did get that. I'm still stuck past that.

Hi lightningbug, I think you didn't get the last bit from daj95376. In the top left 3x3 box, look for 4 cells containing the digits {4567}. So all other cells in that box can't have {4567}. This is what we call a Naked Quad.

Alternatively, there are only 2 cells in the leftmost column/top left 3x3 box which possibly have the digits {38}. So they must hold these 2 digits and nothing else. This is what we call a Hidden Pair.

udosuk

Posts: 2698
Joined: 17 July 2005

Thank you!

Thanks Udosuk! I should have spotted that pair. I've never had to spot a quad before. My skills improve thanks to all of you.

And thanks, Cec for the link. That page does look understandable. I will have to study it sometime.

Thanks so much all! I think I can go on from there.
lightningbug

Posts: 4
Joined: 28 May 2008