Help with a 'hard' puzzle...

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

Help with a 'hard' puzzle...

As you can imagine, I'm new at this. This 'hard' puzzle has me stuck a bit, and I can't seem to see why.

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

And I now have it here:
Code: Select all
7   14   14  |  5    8   2    |  6  9  3
69  3    69  |  4    7   1    |  5  8  2
8   2    5   |  9    6   3    |  7  1  4
-------------+----------------+----------
4   18   3   |  71   5   986  |  2  7  18
56  56   7   |  3    12  86   |  9  4  18
29  18   29  |  271  4   98   |  3  5  6
-------------+----------------+----------
3   7    8   |  6    9   4    |  1  2  5
56  456  46  |  21   21  7    |  8  3  9
12  9    12  |  8    3   5    |  4  6  7

I know it's nothing complicated, but it's the first time I've encountered such a situation, and I'm looking to understand how to go further, rather than just guessing my way through the rest of it.

Thanks.
cwgannon

Posts: 6
Joined: 29 January 2006

You've made a mistake. Your current candidate grid is in error. The simplest thing to do -- maybe the only thing to do -- is start over.
tso

Posts: 798
Joined: 22 June 2005

That's unfortunate. I'll update this post again, then, when I've done so if I get stuck again.

Thanks.
cwgannon

Posts: 6
Joined: 29 January 2006

Re: Help with a 'hard' puzzle...

cwgannon wrote:I'm looking to understand how to go further, rather than just guessing my way through the rest of it.

tso wrote:You've made a mistake. Your current candidate grid is in error. The simplest thing to do -- maybe the only thing to do -- is start over.

But the digits placed are correct, so you really only need to redo the candidates.
ronk
2012 Supporter

Posts: 4764
Joined: 02 November 2005
Location: Southeastern USA

Re: Help with a 'hard' puzzle...

ronk wrote:so you really only need to redo the candidates.

True. Most notable: there is a 7 placed at r4c8, but a pencilmark unerased at r4c4.

Mac
QBasicMac

Posts: 441
Joined: 13 July 2005

Well, that solved it.

Thanks for all the help.
cwgannon

Posts: 6
Joined: 29 January 2006

Dans le carré central,le 7 est obligatoirement en bas ,à gauche(colonne 4;rangée 6).En effet,il ne peut y avoir de 7 dans les colonnes 5 et 6 ni dans les rangées 4 et 5 .
Il y avait une autre solution un peu moins évidente :
Dans le carré milieu/gauche le 9 ne peut être qu'en r6;c1 ou r6;c3 ce qui est d'ailleurs confirmé par vos candidats .
De ce fait, dans le carré central,le 9 ne peut être que dans la rangée4 et dans la colonne 6!
Bonne continuation.
Locqueneux

Posts: 1
Joined: 02 February 2006

Locqueneux: The question is asked in English, the answers so far are given in English and yet you decide to respond in French? If you want that most people can understand your message then you should write it in English. (If you do so then you might get some 'feedback' on it aswell...)
Animator

Posts: 469
Joined: 08 April 2005