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March 11 - Medium

 
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kdbingham



Joined: 23 Feb 2009
Posts: 5
PostPosted: Wed Mar 11, 2009 5:24 pm    Post subject: March 11 - Medium Reply with quote
I'm still working my way through medium puzzles. Every time I think I can progress to the harder puzzles, I get one that stumps me.

Below is what I had when I got stuck.

Code:

+-----------+-------------+------------+
| 4   8  7  | 16   16 2   | 5   3   9  |
| 2   16 3  | 5    4  9   | 16  7   8  |
| 5   9  16 | 8    3  7   | 2   4   16 |
+-----------+-------------+------------+
| 3   5  9  | 7    16 8   | 4   2   16 |
| 7   16 4  | 1369 2  36  | 8   169 5  |
| 16  2  8  | 4    59 56  | 7   169 3  |
+-----------+-------------+------------+
| 8   3  16 | 69   7  4   | 169 5   2  |
| 69  7  5  | 2    8  1   | 3   69  4  |
| 169 4  2  | 369  59 356 | 169 8   7  |
+-----------+-------------+------------+

Play this puzzle online at the Daily Sudoku site

I hated getting a hint, but I did anyway. It put a 6 in r2c7. I cannot figure out why! Maybe my brain isn't working today.
Thanks in advance to anyone that will point out the obvious for me.

--Karin
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Wed Mar 11, 2009 5:44 pm    Post subject: Re: March 11 - Medium Reply with quote
kdbingham wrote:
I'm still working my way through medium puzzles. Every time I think I can progress to the harder puzzles, I get one that stumps me.

Below is what I had when I got stuck.

Code:
+-----------+-------------+------------+
| 4   8  7  | 16   16 2   | 5   3   9  |
| 2   16 3  | 5    4  9   | 16  7   8  |
| 5   9  16 | 8    3  7   | 2   4   16 |
+-----------+-------------+------------+
| 3   5  9  | 7    16 8   | 4   2   16 |
| 7   16 4  | 1369 2  36  | 8   169 5  |
| 16  2  8  | 4    59 56  | 7   169 3  |
+-----------+-------------+------------+
| 8   3  16 | 69   7  4   | 169 5   2  |
| 69  7  5  | 2    8  1   | 3   69  4  |
| 169 4  2  | 369  59 356 | 169 8   7  |
+-----------+-------------+------------+

Play this puzzle online at the Daily Sudoku site

I hated getting a hint, but I did anyway. It put a 6 in r2c7. I cannot figure out why! Maybe my brain isn't working today.
Thanks in advance to anyone that will point out the obvious for me.

--Karin

Welcome to the forum Karin!!!

For some reason, the solver seems to be one step ahead of the PM you listed. If you look at <1> in column 7 [c7] and the intersection with box 9 [b9], you have a Locked Candidate 1 step that'll delete <1> from [r2c7]. This leaves a Naked Single <6> in [r2c7] ... and this matches the hint you reported.

Regards, Danny

The reason I say listed is because pressing the Play link loads the puzzle after both of the steps I described.
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kdbingham



Joined: 23 Feb 2009
Posts: 5
PostPosted: Wed Mar 11, 2009 6:16 pm    Post subject: Reply with quote
daj95376 wrote:
Welcome to the forum Karin!!!

For some reason, the solver seems to be one step ahead of the PM you listed. If you look at <1> in column 7 [c7] and the intersection with box 9 [b9], you have a Locked Candidate 1 step that'll delete <1> from [r2c7]. This leaves a Naked Single <6> in [r2c7] ... and this matches the hint you reported.

Regards, Danny

The reason I say listed is because pressing the Play link loads the puzzle after both of the steps I described.


Thank you, Danny.

I had copied the ASCII code after the hint and then when I pasted it here I added the <1> back into [r2c7].

Are you saying the <169>'s in [r7c7] and [r9c7] eliminate the <1> in [r2c7]?

This one below is what I should have originally listed.

Code:

+-----------+-------------+------------+
| 4   8  7  | 16   16 2   | 5   3   9  |
| 2   16 3  | 5    4  9   | 16  7   8  |
| 5   9  16 | 8    3  7   | 2   4   16 |
+-----------+-------------+------------+
| 3   5  9  | 7    16 8   | 4   2   16 |
| 7   16 4  | 1369 2  36  | 8   169 5  |
| 16  2  8  | 4    59 56  | 7   169 3  |
+-----------+-------------+------------+
| 8   3  16 | 69   7  4   | 169 5   2  |
| 69  7  5  | 2    8  1   | 3   69  4  |
| 169 4  2  | 369  59 356 | 169 8   7  |
+-----------+-------------+------------+

Play this puzzle online at the Daily Sudoku site

(Still trying to figure all this out)
--Karin
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Wed Mar 11, 2009 7:19 pm    Post subject: Reply with quote
Quote:
Are you saying the <169>'s in [r7c7] and [r9c7] eliminate the <1> in [r2c7]?


Yes. In box 9, the value <1> must lie in C7. So, R2C7 cannot be <1>. This is called a line (column, in this case) box intersection.

Best wishes, and welcome!

Keith
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kdbingham



Joined: 23 Feb 2009
Posts: 5
PostPosted: Thu Mar 12, 2009 5:29 pm    Post subject: Reply with quote
OK. I think I'm getting it. Took me a while to work it out in my head.

I just could not get past why it was the <1> eliminated and not the <6> in [r2c7]. But now I see that in box 9, there is no other option for the 1 except in [r7c7] or [r9c7] !!!

Danny and Keith - Thanks so much for your help!
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