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very hard rated by draw and play

 
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peter urhegyi



Joined: 26 Oct 2020
Posts: 14

PostPosted: Wed Aug 25, 2021 9:35 pm    Post subject: very hard rated by draw and play Reply with quote

I think this must be a mistake by the internal rating function. It doesn't need any vh step.
Code:

+-------+-------+-------+
| 1 . . | . . 7 | 9 . 4 |
| . 3 . | . 8 . | . . . |
| . . . | . . 6 | . 2 . |
+-------+-------+-------+
| 4 . 6 | . . . | 8 . . |
| . . . | . 5 . | . . 7 |
| 7 . . | 6 . 9 | . . . |
+-------+-------+-------+
| . . 5 | . . . | . . 3 |
| . 7 . | . 4 . | . 1 . |
| 8 . 9 | . . 2 | . . . |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site
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Mogulmeister



Joined: 03 May 2007
Posts: 873

PostPosted: Thu Aug 26, 2021 8:29 am    Post subject: Reply with quote

Yes, I agree Peter. The rating algorithm got foxed?
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Clement



Joined: 24 Apr 2006
Posts: 1057
Location: Dar es Salaam Tanzania

PostPosted: Sat Sep 04, 2021 11:30 am    Post subject: very hard rated by draw and play Reply with quote

Code:

+---------------------+----------------------+-----------------------+
| 1      6      d28   | 235      23      7   | 9       c358     4    |
| 259    3       47   | 12459    8       145 | 1567     567     156  |
| 59     89      47   | 13459    139     6   | 1357     2      b158  |
+---------------------+----------------------+-----------------------+
| 4      259     6    | 127      127     3   | 8        59      1259 |
|f239    29    fd1*23 | 48       5       48  |f136     f369     7    |
| 7      258     1238 | 6        12      9   | 1345     345     125  |
+---------------------+----------------------+-----------------------+
| 26     14      5    | 1789     1679    18  | 2467     8-9     3    |
|e236    7      d23*  | 589      4       58  | 256      1      a89   |
| 8      14      9    | 1357     1367    2   | 4567     4567    56   |
+---------------------+----------------------+-----------------------+

(9=8)r8c9 r3c9 = r1c8 (8=23*1*)r185c3 (3)r8c1 = (31*69)5c1378 => - 9r7c8; btte
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dongrave



Joined: 06 Mar 2014
Posts: 443

PostPosted: Sat Sep 04, 2021 3:46 pm    Post subject: Reply with quote

Hi Clement, I think you got tricked by the wrong rating! Your grid can be solved using just basics. There's a hidden pair 29 in row 2 (corrected on 09/05/21, it previously said 'column 2') which leads to a unique 5 in column 1 and then from there it can eventually be solved.

Last edited by dongrave on Sun Sep 05, 2021 12:59 pm; edited 2 times in total
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Clement



Joined: 24 Apr 2006
Posts: 1057
Location: Dar es Salaam Tanzania

PostPosted: Sat Sep 04, 2021 4:58 pm    Post subject: Reply with quote

dongrave wrote:
Hi Clement, I think you got tricked by the wrong rating! Your grid can be solved using just basics. There's a hidden pair 29 in column 2 which leads to a unique 5 in column 1 and then from there it can eventually be solved.
Sure, my grid is incomplete r5c2 is solved it is 2 leaving a naked pair 59 in r5c28 which completes it. Shame upon me Embarassed
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Mogulmeister



Joined: 03 May 2007
Posts: 873

PostPosted: Sat Sep 04, 2021 6:27 pm    Post subject: Reply with quote

I think this is a grid that Keith might approve of. For a p&p solver there are a lot of hidden pairs and a triple and this requires a lot of diligence to hack your way out just using basics.
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