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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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 Posted: Wed Feb 22, 2012 4:22 pm Post subject: Vanhegan extreme |
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Puzzle 6-633429, rated 1.3.0.1.1
Played one Finned X-Wing but hit the brick wall.
| Code: |
+----------------+---------------+---------------+
| 3 57 159 | 589 589 6 | 179 4 2 |
| 4 6 1259 | 2359 7 135 | 139 1359 8 |
| 125 257 8 | 4 259 135 | 6 13579 35 |
+----------------+---------------+---------------+
| 7 248 24 | 38 1 348 | 5 6 9 |
| 59 1 6 | 7 59 2 | 34 8 34 |
| 589 458 3 | 589 6 458 | 27 27 1 |
+----------------+---------------+---------------+
| 125 3 7 | 6 245 9 | 8 125 45 |
| 1258 2458 1245 | 25 3 7 | 1249 1259 6 |
| 6 9 245 | 1 2458 58 | 234 235 7 |
+----------------+---------------+---------------+
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Play this puzzle online at the Daily Sudoku site |
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JC Van Hay
Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
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| Posted: Wed Feb 22, 2012 6:28 pm Post subject: |
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From a B/B-Plot POV, the first weakest points in the brick wall to look at are the cells r2c4, r1c7 and r3c8.
"Fortunately", they enter into an AIC (involving only bilocals) as follows :
| Code: | +--------------------+----------------------+--------------------+
| 3 57 5(19) | 589 589 6 | 9(17) 4 2 |
| 4 6 15(29) | 35-9(2) 7 135 | 139 1359 8 |
| 125 257 8 | 4 5-2(9) 135 | 6 135(79) 35 |
+--------------------+----------------------+--------------------+
| 7 248 24 | 38 1 348 | 5 6 9 |
| 59 1 6 | 7 59 2 | 34 8 34 |
| 589 458 3 | 589 6 458 | 27 27 1 |
+--------------------+----------------------+--------------------+
| 125 3 7 | 6 245 9 | 8 125 45 |
| 1258 2458 1245 | 25 3 7 | 1249 1259 6 |
| 6 9 245 | 1 2458 58 | 234 235 7 |
+--------------------+----------------------+--------------------+
5-SIS AIC : 2r2c4=(2-9)r2c3=(9-1)r1c3=(1-7)r1c7=(7-9)r3c8=9r3c5 => -9r2c4, -2r3c5; stte |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Wed Feb 22, 2012 8:17 pm Post subject: |
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| JC Van Hay wrote: |
| Code: | +--------------------+----------------------+--------------------+
| 3 57 5(19) | 589 589 6 | 9(17) 4 2 |
| 4 6 15(29) | 35-9(2) 7 135 | 139 1359 8 |
| 125 257 8 | 4 5-2(9) 135 | 6 135(79) 35 |
+--------------------+----------------------+--------------------+
| 7 248 24 | 38 1 348 | 5 6 9 |
| 59 1 6 | 7 59 2 | 34 8 34 |
| 589 458 3 | 589 6 458 | 27 27 1 |
+--------------------+----------------------+--------------------+
| 125 3 7 | 6 245 9 | 8 125 45 |
| 1258 2458 1245 | 25 3 7 | 1249 1259 6 |
| 6 9 245 | 1 2458 58 | 234 235 7 |
+--------------------+----------------------+--------------------+
5-SIS AIC : 2r2c4=(2-9)r2c3=(9-1)r1c3=(1-7)r1c7=(7-9)r3c8=9r3c5 => -9r2c4, -2r3c5; stte |
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My favorite pattern is there also: there is a strong link in 2 from r2c4 to both r2c3 and r3c5 which are connected as you show. The result is r2c4 has to be a 2.
2r2c4=(2-9)r2c3=(9-1)r1c3=(1-7)r1c7=(7-9)r3c8=(9-2)r3c5=2r2c4 => r2c4=2 |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Feb 22, 2012 10:34 pm Post subject: |
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Thanks JC and Dan for the responses, which I unfortunately don't understand.
I don't know what "B/B-plot" and "bilocals" mean and can't follow the AIC chain.
Dan, can you spot that pattern and know what cell must=2 or do you have to do some testing after you spot it? Does the pattern have a name?
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Wed Feb 22, 2012 11:20 pm Post subject: |
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| Marty R. wrote: | | Dan, can you spot that pattern and know what cell must=2 or do you have to do some testing after you spot it? Does the pattern have a name? |
I look for a cell with a candidate with two strong links. Then I try to connect the linked cells with a chain. If I can the cell with two strong links can be set to the candidate.
if the start of the chain = 2 and the end of the chain = 2 and both are the same cell then it must = 2.
I have to admit I missed this one. I spotted it in JC's solution.
It is called a Discontinuous loop or a turbot fish if the chain contains 5 cells.
hope this helps
dan |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Wed Feb 22, 2012 11:43 pm Post subject: |
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| Code: | (2)r2c4=(2-9)r2c3=(9-1)r1c3=(1-7)r1c7=(7-9)r3c8=(9-2)r3c5=(2)r2c4 => r2c4=2
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Dan's chain as a sequence of overlapping strong links:
| Code: | r2c4<>2 -> r2c3=3
r2c3<>9 -> r1c3=9
r1c3<>1 -> r1c7=1
r1c7<>7 -> r3c8=7
r3c8<>9 -> r3c5=9
r3c5<>2 -> r2c4=2
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JC Van Hay
Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
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| Posted: Fri Feb 24, 2012 7:57 am Post subject: |
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| Marty R. wrote: | | I don't know what "B/B-plot" and "bilocals" mean and can't follow the AIC chain. |
Marty, Sudopedia is now accessible again. Look for the definitions and eventually for more informations from here.
Best regards, JC. |
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