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And another one from 1sudoku

 
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dongrave



Joined: 06 Mar 2014
Posts: 563

PostPosted: Tue Sep 06, 2016 10:51 pm    Post subject: And another one from 1sudoku Reply with quote

Sometimes I find 'nice' clean chains for 1sudoku's Evil puzzles - and then sometimes I find ones so ugly that I have trouble representing them in Eureka (like this one)!
Code:

nš57408 Evil
 +-------+-------+-------+
 | . . . | 5 7 . | . . 4 |
 | . . 2 | . . 6 | . . . |
 | . 7 8 | . 2 3 | . . . |
 +-------+-------+-------+
 | 8 . . | . . . | 2 7 . |
 | 6 . 5 | . . . | 8 . 9 |
 | . 3 7 | . . . | . . 6 |
 +-------+-------+-------+
 | . . . | 2 8 . | 3 1 . |
 | . . . | 3 . . | 4 . . |
 | 3 . . | . 5 4 | . . . |
 +-------+-------+-------+
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JC Van Hay



Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium

PostPosted: Tue Sep 06, 2016 11:31 pm    Post subject: Reply with quote

Key of the puzzle : 2B45
Code:
+------------------+------------------+------------------+
| 19      6     3  | 5    7     8     | 19    2     4    |
| 1459    1459  2  | 149  149   6     | 7     38    38   |
| 149     7     8  | 149  2     3     | 1569  569   15   |
+------------------+------------------+------------------+
| 8       19    4  | 169  1369  15    | 2     7     135  |
| 6       1(2)  5  | 147  134   1(27) | 8     34    9    |
| 19(2)   3     7  | 8    149   125   | 15    45    6    |
+------------------+------------------+------------------+
| 457     45    6  | 2    8     9     | 3     1     57   |
| 5-7(2)  258   19 | 3    16    1(7)  | 4     5689  2578 |
| 3       28    19 | 167  5     4     | 69    689   278  |
+------------------+------------------+------------------+
L2-Wing[2r8c1=2r6c1-2r5c2=(2-7)r5c6=7r8c6]-7r8c1; stte
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Marty R.



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

PostPosted: Wed Sep 07, 2016 7:08 pm    Post subject: Reply with quote

Code:



+--------------------------+--------------------------+--------------------------+
| 19      6       3        | 5       7       8        | 19      2       4        |
| 1459    1459    2        | 149     149     6        | 7       38      38       |
| 149     7       8        | 149     2       3        | 1569    569     15       |
+--------------------------+--------------------------+--------------------------+
| 8       19      4        | 169     1369    15       | 2       7       135      |
| 6       12      5        | 147     134     127      | 8       34      9        |
| 129     3       7        | 8       149     125      | 15      45      6        |
+--------------------------+--------------------------+--------------------------+
| 457     45      6        | 2       8       9        | 3       1       57       |
| 257     258     19       | 3       16      17       | 4       5689    2578     |
| 3       28      19       | 167     5       4        | 69      689     278      |
+--------------------------+--------------------------+--------------------------+


DP (28)r89c29 externals and internals
5r8c2=8r2c9-(8=3)r2c8-(3=45)r56c8=> -5r8c8
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Marty R.



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

PostPosted: Thu Sep 08, 2016 4:22 am    Post subject: Reply with quote

Quote:
sometimes I find ones so ugly that I have trouble representing them in Eureka (like this one)!


Don't keep me in suspense. Let's see it!
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bat999



Joined: 09 Jul 2015
Posts: 55
Location: UK

PostPosted: Thu Sep 08, 2016 2:30 pm    Post subject: Reply with quote

Code:
.------------------.-----------------.--------------------.
|  19     6     3  | 5    7      8   |  19     2     4    |
|  1459   1459  2  | 149  149    6   |  7     a38    38   |
|  149    7     8  | 149  2      3   |  1569   569   15   |
:------------------+-----------------+--------------------:
|  8     c19    4  | 169  1369   15  |  2      7     135  |
|  6     c12    5  | 147  134    127 |  8     a34    9    |
| b129    3     7  | 8    149   b125 | b15    a45    6    |
:------------------+-----------------+--------------------:
|  457    45    6  | 2    8      9   |  3      1     57   |
|  257    258   19 | 3    16     17  |  4      5689  2578 |
|  3     c28    19 | 167  5      4   |  69     69-8  278  |
'------------------'-----------------'--------------------'
(8=5)r256c8 - (5=9)r6c167 - (9=8)r459c2 => -8 r9c8; lclste
Cool
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dongrave



Joined: 06 Mar 2014
Posts: 563

PostPosted: Thu Sep 08, 2016 10:15 pm    Post subject: Reply with quote

Marty R. wrote:
Quote:
sometimes I find ones so ugly that I have trouble representing them in Eureka (like this one)!


Don't keep me in suspense. Let's see it!

I can't find it! Someone cleaned off the dining room table (I can assure you it wasn't me!) I'm going to try to redo it! Darn it all.
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dongrave



Joined: 06 Mar 2014
Posts: 563

PostPosted: Fri Sep 09, 2016 12:33 am    Post subject: Reply with quote

Okay, well that wasn't so bad - I found this elegant solution just as easily the second time. Boy, it's just as ugly this time as it was the first time I found it. Okay, here goes: 7r7c9-(7=45)r7c12-(5=28)r89c2-2r5c2=(2-7)r5c6=r8c6-r8c1 (no 7 in c1 or B7) contradiction =>r7c9<>7 solves it. Alright now, all you experts, you know that I want your advice! Thanks, Don.
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Marty R.



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

PostPosted: Fri Sep 09, 2016 4:06 am    Post subject: Reply with quote

Don, Ive seen solutions that are a little stronger in the elegance department.

The first two ALS's could get you in trouble under different circumstances. The first one has two 5s. Had you needed a 5 in either c1 or c2, the ALS would've been invalid because you couldn't say that the 5 belonged in one cell or the other. You got away with it because both cells are in the same box. Same concept with the 2s in the 2nd ALS. It worked because both both are in the same column. Had you wanted to continue the chain in either r8 or r9, the ALS putting a 2 in either row would've been invalid.
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dongrave



Joined: 06 Mar 2014
Posts: 563

PostPosted: Fri Sep 09, 2016 9:18 pm    Post subject: Reply with quote

Thanks Marty! I think I need some more practice! Hey, you know what? Just glancing at it again I noticed that the dumbest thing of all was involving r7c9. It's not even necessary. It's still ugly but starting with r7c1<>7 and showing that r8c1<>7 would have been a little more elegant for sure! ugh.
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