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Jan 28 H, but interesting

 
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rmireland



Joined: 21 Sep 2013
Posts: 33
Location: New Orleans
PostPosted: Mon Feb 13, 2017 4:21 am    Post subject: Jan 28 H, but interesting Reply with quote
Code:

+------------+----------------+------------------+
| 234 79  24 | 49  34789 6    | 378   5    1     |
| 13  67  5  | 17  1378  2    | 4     9    3678  |
| 134 679 8  | 5   13479 1479 | 37    67   2     |
+------------+----------------+------------------+
| 9   8   16 | 167 2     3    | 5     4    67*   |
| 5   24  16 | 49  14679 1479 | 12378 2678 36789 |
| 24  3   7  | 8   5     149  | 12    26   69    |
+------------+----------------+------------------+
| 7   24  24 | 16  16    8    | 9     3    5     |
| 8   5   3  | 2   479   479  | 6     1    47    |
| 6   1   9  | 3   47    5    | 278   278  478   |
+------------+----------------+------------------+


Play this puzzle online at the Daily Sudoku site

Hi Sudoku Guys:
I was playing the Jan 28 H puzzle because I think the H's are more fun. This one was especially interesting. I was stuck at this point, so I asked for a hint. So far, so good. Draw/Play suggested that I play a 7 (of the 67 candidates) in r4c9. Probably will be productive.
The interesting part was that in the comments section, Draw/Play was "unable to explain" this hint, but the puzzle is still rated as "hard". I can see that in r6 the 6 must be in c8 or c9, meaning all other 6's in box 6 can be eliminated, leaving that suggested 7 as the only candidate.
I am unable to explain why Draw/Play is unable to explain. I have not encountered this before where Draw/Play refuses to explain a basic move. Can anyone explain the lack of explanation to me?
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Mon Feb 13, 2017 6:58 pm    Post subject: Reply with quote
The reason is quite elementary: Where does 6 fit in R6? (Row-Box intersection.)

I have no idea on the internal workings of Draw / Play.

Keith
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