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dongrave
Joined: 06 Mar 2014 Posts: 568
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Posted: Sun Jul 08, 2018 2:26 pm Post subject: 1sudoku Evil puzzle |
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I enjoyed finding a one step solution for this one today. (Helmut's VH today was too easy.)
Code: |
1sudoku.com, #56259, Evil.
+-------+-------+-------+
| . . 1 | 8 . . | . 4 . |
| . 4 . | 1 3 . | . . 9 |
| . . 7 | . . . | 2 . . |
+-------+-------+-------+
| 7 . . | . 1 . | . . . |
| . 8 . | . 5 . | . 1 . |
| . . . | . 4 . | . . 3 |
+-------+-------+-------+
| . . 6 | . . . | 5 . . |
| 9 . . | . 7 4 | . 3 . |
| . 3 . | . . 6 | 8 . . |
+-------+-------+-------+
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[/code] |
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Clement
Joined: 24 Apr 2006 Posts: 1111 Location: Dar es Salaam Tanzania
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Posted: Sun Jul 08, 2018 5:52 pm Post subject: |
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Code: |
+-------+-------+-------+
| . . 1 | 8 . . | . 4 . |
| . 4 . | 1 3 . | . . 9 |
| . . 7 | . . . | 2 . . |
+-------+-------+-------+
| 7 . . | . 1 . | . . . |
| . 8 . | . 5 . | . 1 . |
| . . . | . 4 . | . . 3 |
+-------+-------+-------+
| . . 6 | . . . | 5 . . |
| 9 . . | . 7 4 | . 3 . |
| . 3 . | . . 6 | 8 . . |
+-------+-------+-------+
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Play this puzzle online at the Daily Sudoku site
Last edited by Clement on Mon Jul 09, 2018 8:18 am; edited 1 time in total |
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dongrave
Joined: 06 Mar 2014 Posts: 568
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Posted: Sun Jul 08, 2018 9:50 pm Post subject: |
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Hey! I thought Clement would provide a solution, not the starting grid that I posted? What's up with that? (Did I make a mistake in the grid?) |
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Clement
Joined: 24 Apr 2006 Posts: 1111 Location: Dar es Salaam Tanzania
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Posted: Mon Jul 09, 2018 7:26 am Post subject: |
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dongrave wrote: | Hey! I thought Clement would provide a solution, not the starting grid that I posted? What's up with that? (Did I make a mistake in the grid?) | No, you did not make a mistake. My aim was to make a printable version and after that delete it, I failed to delete the submission as I usually do. I am sorry for that, I will provide a solution. It is good puzzle Dongrave. |
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Clement
Joined: 24 Apr 2006 Posts: 1111 Location: Dar es Salaam Tanzania
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Posted: Mon Jul 09, 2018 8:13 am Post subject: |
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Two steps a chain and W-Wing Code: |
+-------------------------+-----------------------+----------------------+
| e26* e269 1 | 8 d269 7 | 3 4 5 |
| 8 4 g25 | 1 3 25 | 67 67 9 |
| 3 f569 7 | 4 69 59 | 2 8 1 |
+-------------------------+-----------------------+----------------------+
| 7 6-2 2349 | 269 1 239 | 469 5 8 |
| j246 8 2349 | 2679 5 239 | 4679 1 27 |
| 5 1 29 | 2679 4 8 | 679 267 3 |
+-------------------------+-----------------------+----------------------+
| i4*-2 7 6 | 3 8 1 | 5 9 24 |
| 9 a25 8 | b25 7 4 | 1 3 6 |
| 1 3 h245 | 259 c29 6 | 8 27 247 |
+-------------------------+-----------------------+----------------------+
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Step 1: (2)r8c2 = r8c4 - r9c5 = r1c5 - (2=6*9)r1c12 - (69=5)r3c2 - r2c3 = (5-4)r9c3 = (4*)r7c1 - (4*6*=2)r5c1 => - 2r4c2,r7c1
Code: | Opens the following Grid
+------------------+---------------------+----------------+
| 6 a29 1 | 8 2-9 7 | 3 4 5 |
| 8 4 b25 | 1 3 25 | 7 6 9 |
| 3 59 7 | 4 6 59 | 2 8 1 |
+------------------+---------------------+----------------+
| 7 6 34 | 29 1 239 | 49 5 8 |
| 2 8 34 | 6 5 39 | 49 1 7 |
| 5 1 9 | 7 4 8 | 6 2 3 |
+------------------+---------------------+----------------+
| 4 7 6 | 3 8 1 | 5 9 2 |
| 9 25 8 | 25 7 4 | 1 3 6 |
| 1 3 c25 | 259 d29 6 | 8 7 4 |
+------------------+---------------------+----------------+
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Step 2: Wing on (29)r1c2,r9c5 with SL in col3
(9=2)r1c2 - r2c3 = r9c3 - (2=9)r9c5 = - 9r1c5; stte
There may be a better solution. |
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dongrave
Joined: 06 Mar 2014 Posts: 568
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Posted: Mon Jul 09, 2018 8:11 pm Post subject: |
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Thanks Clement! I found a one step solution. You want to see it? (I think I got the notation right.) Let me know if I screwed up the notation (or the entire solution!)
(5=2)r8c4-(2=679)r456c4-(9=23)r45c6-(2=5)r2c6-r2c3=r3c2=>r8c2<>5. |
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Clement
Joined: 24 Apr 2006 Posts: 1111 Location: Dar es Salaam Tanzania
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Posted: Tue Jul 10, 2018 10:31 am Post subject: |
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dongrave wrote: | Thanks Clement! I found a one step solution. You want to see it? (I think I got the notation right.) Let me know if I screwed up the notation (or the entire solution!)
(5=2)r8c4-(2=679)r456c4-(9=23)r45c6-(2=5)r2c6-r2c3=r3c2=>r8c2<>5. | Yes, it is a good, better solution including the notation. Bravo! |
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dongrave
Joined: 06 Mar 2014 Posts: 568
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Posted: Wed Jul 11, 2018 1:04 am Post subject: |
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Clement wrote: | dongrave wrote: | Thanks Clement! I found a one step solution. You want to see it? (I think I got the notation right.) Let me know if I screwed up the notation (or the entire solution!)
(5=2)r8c4-(2=679)r456c4-(9=23)r45c6-(2=5)r2c6-r2c3=r3c2=>r8c2<>5. | Yes, it is a good, better solution including the notation. Bravo! |
Thanks Clement! You probably don't remember but I learned about chains w/ pincers on both ends a couple of years ago from you (Marty had to explain them to me!). They immediately became my favorite method of solving puzzles in one step. |
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