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dongrave
Joined: 06 Mar 2014
Posts: 572
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 Posted: Sun Oct 11, 2015 4:18 pm Post subject: Another Evil one from 1sudoku.net |
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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
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| Posted: Sun Oct 11, 2015 5:18 pm Post subject: |
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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 |
+---------------+---------------------+-------------+
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[(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
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| Posted: Sun Oct 11, 2015 6:23 pm Post subject: |
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| 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 |
+--------------+--------------+-----------+
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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: 572
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| Posted: Sun Oct 11, 2015 9:10 pm Post subject: |
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| 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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