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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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 Posted: Wed Sep 21, 2011 1:18 am Post subject: Vanhegan extreme |
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I can't find a happy medium at Vanhegan; the Fiendish are easy, the Extreme are generally too hard. This is puzzle 6-1431830, rated 2.0.0.1.1. After a useless ER and XY-Chain I'm stuck. There are a few flightless wings in which I can't see a transport.
| Code: |
+--------------+----------------+---------------+
| 1 4 568 | 2356 238 2568 | 7 368 9 |
| 2 3 689 | 469 7 489 | 5 1 68 |
| 58 569 7 | 13569 138 589 | 38 4 2 |
+--------------+----------------+---------------+
| 7 56 3568 | 26 4 1 | 2389 3589 58 |
| 9 2 4 | 8 5 3 | 6 7 1 |
| 358 1 3568 | 7 9 26 | 238 358 4 |
+--------------+----------------+---------------+
| 4 7 359 | 2359 238 2589 | 1 5689 568 |
| 35 8 1 | 3459 6 459 | 49 2 7 |
| 6 59 2 | 1459 18 7 | 489 589 3 |
+--------------+----------------+---------------+
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Play this puzzle online at the Daily Sudoku site |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Wed Sep 21, 2011 1:44 am Post subject: |
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Marty,
Based on what Sudoku Susser says, this is too extreme for me.
Keith |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Sep 21, 2011 3:48 am Post subject: |
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| keith wrote: | Marty,
Based on what Sudoku Susser says, this is too extreme for me.
Keith |
In that case, then I don't feel too badly. |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Wed Sep 21, 2011 7:17 am Post subject: |
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My solver's default solution used two chains and numerous additional steps. Nothing friendly. However, an analysis pass discovered there was a SIN that cracked the puzzle at this point. I converted it into something semi-understandable.
| Code: | +-----------------------------------------------------------------------+
| 1 4 568 | 2356 238 2568 | 7 368 9 |
| 2 3 689 | 469 7 489 | 5 1 68 |
| 58 569 7 | 13569 138 589 | 38 4 2 |
|-----------------------+-----------------------+-----------------------|
| 7 56 3568 | 26 4 1 | 2389 3589 58 |
| 9 2 4 | 8 5 3 | 6 7 1 |
| 358 1 3568 | 7 9 26 | 238 358 4 |
|-----------------------+-----------------------+-----------------------|
| 4 7 359 | 2359 238 2589 | 1 5689 568 |
| 35 8 1 | 3459 6 459 | 49 2 7 |
| 6 59 2 | 1459 18 7 | 489 589 3 |
+-----------------------------------------------------------------------+
# 84 eliminations remain
(1=38)r3c57-(8=5)r3c1-(5)r1c3= finned X-Wing c39\r47 -(5=6)r4c2-r3c2=(6)r3c4 => r3c4<>1
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Regards, Danny |
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susume
Joined: 13 May 2011
Posts: 36
Location: Southeastern US
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| Posted: Fri Sep 23, 2011 2:37 am Post subject: |
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It certainly wasn't "friendly." I managed it with three Nice Loops and an X chain, which I append here not for any claim to beauty, but in case anyone has a bad case of insomnia:
| Code: | Continuous Nice Loop: (1)r3c4 = r9c4 -(1=8)r9c5 - r9c78 =(86-5)r7c89 = r4c9 -(5=6)r4c2 - r3c2 =(6)r3c4; r3c4<>359, r4c38<>5
(6)r3c2 =(6-1)r3c4 = r9c4 -(1=8)r9c5 - r9c78 =(86-5)r7c89 =(5)r9c8 -(5=9)r9c2 -(9)r3c2; r3c2<>9
(4)r2c4 =(4-8)r2c6 = r2c9 -(8=5)r4c9 -(5=6)r4c2 - r3c2 = r3c4 -(6)r2c4; r2c4<>6=4
(5)r7c3 = r8c1 - r3c1 = r3c2 - r4c2 = r4c9; r7c9<>5 |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sat Sep 24, 2011 2:14 am Post subject: |
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SS says:
4 x Comprehensive Forcing Chains
5 x Simple Forcing Chains
1 x XY-Wing
1 x Intersection Removal
4 x Pinned Squares
Out of my league. In my opinion.
Keith |
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