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dongrave
Joined: 06 Mar 2014
Posts: 568
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 Posted: Tue Sep 06, 2016 10:51 pm Post subject: And another one from 1sudoku |
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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
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| Posted: Tue Sep 06, 2016 11:31 pm Post subject: |
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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 |
+------------------+------------------+------------------+
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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
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| Posted: Wed Sep 07, 2016 7:08 pm Post subject: |
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| 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 |
+--------------------------+--------------------------+--------------------------+
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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
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| Posted: Thu Sep 08, 2016 4:22 am Post subject: |
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| 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
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| Posted: Thu Sep 08, 2016 2:30 pm Post subject: |
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| 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
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dongrave
Joined: 06 Mar 2014
Posts: 568
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| Posted: Thu Sep 08, 2016 10:15 pm Post subject: |
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| 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: 568
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| Posted: Fri Sep 09, 2016 12:33 am Post subject: |
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| 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
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| Posted: Fri Sep 09, 2016 4:06 am Post subject: |
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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: 568
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| Posted: Fri Sep 09, 2016 9:18 pm Post subject: |
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| 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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