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Another Evil one from 1sudoku.net

 
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dongrave



Joined: 06 Mar 2014
Posts: 568

PostPosted: Sun Oct 11, 2015 4:18 pm    Post subject: Another Evil one from 1sudoku.net Reply with quote

Can someone out there show me a 'nice' single step solution for this Evil rated puzzle from 1sudoku.net? I know it can be done - but my single stepper is so ugly that I can't even express it in Eureka!

Code:

nš517424 Evil
 +-------+-------+-------+
 | 8 . 6 | . . 1 | 2 . . |
 | . . . | . 4 . | . 7 . |
 | . 1 . | 6 . . | 5 . . |
 +-------+-------+-------+
 | . . 7 | 5 . . | 1 . . |
 | 1 . . | 3 . 6 | . . 8 |
 | . . 9 | . . 7 | 3 . . |
 +-------+-------+-------+
 | . . 1 | . . 2 | . 6 . |
 | . 2 . | . 3 . | . . . |
 | . . 4 | 1 . . | 8 . 3 |
 +-------+-------+-------+
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JC Van Hay



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

PostPosted: Sun Oct 11, 2015 5:18 pm    Post subject: Reply with quote

Analysis of the puzzle from the 2 solutions of either R1 or the digit 2 gives a chain equivalent to the following Wing :
Code:
+---------------+---------------------+-------------+
| 8    47   6   | 79      5       1   | 2   3    49 |
| 259  59   235 | (28)    4       38  | 6   7    1  |
| 47   1    23  | 6       9-2(7)  39  | 5   8    49 |
+---------------+---------------------+-------------+
| 3    68   7   | 5       289     489 | 1   49   26 |
| 1    45   25  | 3       29      6   | 7   459  8  |
| 245  68   9   | 248     1       7   | 3   45   26 |
+---------------+---------------------+-------------+
| 59   3    1   | 479(8)  9(78)   2   | 49  6    57 |
| 6    2    8   | 479     3       459 | 49  1    57 |
| 579  579  4   | 1       6       59  | 8   2    3  |
+---------------+---------------------+-------------+
[(2=8)r2c4-8r7c4=(8-7)r7c5=7r3c5]-2r3c5; stte
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Marty R.



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

PostPosted: Sun Oct 11, 2015 6:23 pm    Post subject: Reply with quote

Code:

+--------------+--------------+-----------+
| 8   47   6   | 79   5   1   | 2  3   49 |
| 259 59   235 | 28   4   38  | 6  7   1  |
| 47  1    23  | 6    279 39  | 5  8   49 |
+--------------+--------------+-----------+
| 3   68   7   | 5    289 489 | 1  49  26 |
| 1   45   25  | 3    29  6   | 7  459 8  |
| 245 68   9   | 248  1   7   | 3  45  26 |
+--------------+--------------+-----------+
| 579 3579 1   | 4789 789 2   | 49 6   57 |
| 6   2    8   | 479  3   459 | 49 1   57 |
| 579 579  4   | 1    6   59  | 8  2   3  |
+--------------+--------------+-----------+

Play this puzzle online at the Daily Sudoku site

UR (49)r78c47, using externals


9r1c4=4r6c4-(4=52)r6c1-(2=54)r5c23-(4=7)r1c2-(7=9)r1c4=> =9r1c4
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dongrave



Joined: 06 Mar 2014
Posts: 568

PostPosted: Sun Oct 11, 2015 9:10 pm    Post subject: Reply with quote

Cool! You guys make it look easy! I'm having a tough time finding the chains necessary to solve some of these 1sudoku.net Evil puzzles. (ugh.)
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