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April 1 Hard

 
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swando



Joined: 09 Mar 2009
Posts: 17
Location: Surrey, BC. Canada

PostPosted: Thu Apr 02, 2009 1:44 am    Post subject: April 1 Hard Reply with quote

Maybe I'm blind today or did it wrong but have tried 2x... The hint is 9 in C2 R7. Can some tell me what I missed?


| 38 38 7 | 9 56 56 | 1 2 4 |
| 6 5 1 | 8 4 2 | 9 7 3 |
| 9 4 2 | 1 3 7 | 5 6 8 |
+-------------+----------------+-----------+
| 7 6 8 | 24 12 9 | 3 14 5 |
| 2 19 59 | 3 1578 458 | 78 149 6 |
| 135 139 4 | 6 1578 58 | 78 19 2 |
+-------------+----------------+-----------+
| 45 29 3 | 2457 2567 1 | 26 8 79 |
| 18 128 6 | 27 9 3 | 4 5 17 |
| 1458 7 59 | 245 2568 4568 | 26 3 19 |
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Thu Apr 02, 2009 4:07 am    Post subject: Re: April 1 Hard Reply with quote

swando wrote:
Maybe I'm blind today or did it wrong but have tried 2x... The hint is 9 in C2 R7. Can some tell me what I missed?


Code:
| 38   38  7  | 9    56   56   | 1  2   4  |
| 6    5   1  | 8    4    2    | 9  7   3  |
| 9    4   2  | 1    3    7    | 5  6   8  |
+-------------+----------------+-----------+
| 7    6   8  | 24   12   9    | 3  14  5  |
| 2    19  59 | 3    1578 458  | 78 149 6  |
| 135  139 4  | 6    1578 58   | 78 19  2  |
+-------------+----------------+-----------+
| 45   29  3  | 2457 2567 1    | 26 8   79 |
| 18   128 6  | 27   9    3    | 4  5   17 |
| 1458 7   59 | 245  2568 4568 | 26 3   19 |


You have in column 4 the 5 and 7 needing to be in box 8. Once you remove the other 5s and 7s from that box you may see the answer.
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Zoelly



Joined: 15 Mar 2009
Posts: 8

PostPosted: Mon Apr 06, 2009 3:37 am    Post subject: April 1, Hard Reply with quote

Hi Swando,
I was in similar "blind" mode on this one for days.
This evening I finally saw the numbers that broke the log jam.

Did you get it solved? If not, I'll give a hint.
Zoelly
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David C



Joined: 21 Apr 2009
Posts: 2
Location: Virginia, USA

PostPosted: Tue Apr 21, 2009 5:30 am    Post subject: April 1 Hard Reply with quote

Hello Zoelly,

Some of us are still in a "blind mode" on this one. May we have your hint, please?

David C[/quote][/b]
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storm_norm



Joined: 18 Oct 2007
Posts: 1741

PostPosted: Tue Apr 21, 2009 6:43 pm    Post subject: Reply with quote

Code:
.------------------.------------------.------------------.
| 38    38    7    | 9     56    56   | 1     2     4    |
| 6     5     1    | 8     4     2    | 9     7     3    |
| 9     4     2    | 1     3     7    | 5     6     8    |
:------------------+------------------+------------------:
| 7     6     8    | 24    12    9    | 3     14    5    |
| 2     19    59   | 3     1578  458  | 78    149   6    |
| 135   139   4    | 6     1578  58   | 78    19    2    |
:------------------+------------------+------------------:
| 45    29    3    | 2457  2567  1    | 26    8     79   |
| 18    128   6    | 27    9     3    | 4     5     17   |
| 1458  7     59   | 245   2568  4568 | 26    3     19   |
'------------------'------------------'------------------'

everything happens with respect to box 8

first notice the 7's in column 5... they can only be in box 5 in col 5, so you can remove the 7 at r7c5 (pointing pair)

then notice the 8's in row 9... they can only exist in box 8 in row 9, so this removes the 8 in r9c1. (pointing pair)

the tricky one to see is the 5's like Marty mentioned... there are only two 5's in column 4 and they happen to exist in box 8. so this eliminates the 5's in r79c5 and r9c6. (box/line interaction)

after all that dust settles, with the 5 and 7 gone from r7c5, the {2,6} naked pair remains in row 7.
that naked pair should end the blindness.
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David C



Joined: 21 Apr 2009
Posts: 2
Location: Virginia, USA

PostPosted: Tue Apr 21, 2009 9:43 pm    Post subject: April 1 Hard Reply with quote

Thank you, Norm. I got it!!

It was one of those cases where it was right there in front of me but I didn’t see it until you pointed it out, patiently, and in very clear steps. I appreciate your assistance.

David C.
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