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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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 Posted: Fri Mar 26, 2010 3:18 pm Post subject: LA Times (Free Press?) Fri Mar 26 |
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difficult.
| Code: |
+-----------+-----------+-----------+
| . . . | . . . | . 1 4 |
| 3 . . | 6 . . | . . 2 |
| . . . | 7 . . | . 9 5 |
+-----------+-----------+-----------+
| 1 . . | . 2 . | . 6 . |
| . . 4 | . . . | 7 . . |
| . 7 . | 5 9 . | . . 3 |
+-----------+-----------+-----------+
| 2 8 . | . . 6 | . . . |
| . . . | . . 5 | . . 6 |
| 9 1 . | . . . | . . . |
+-----------+-----------+-----------+
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play online
| Quote: | | w-wing 28 and then? |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Fri Mar 26, 2010 5:07 pm Post subject: |
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I was just about to post it. I am stuck at the same spot.
Keith |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Fri Mar 26, 2010 5:31 pm Post subject: |
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The W-Wing and fined X-Wing appear to be extraneous.
It appears to need a chain or an ALS, but they only get you past the bottleneck.
| chain hint wrote: | Connect strong links on: 2, 9, 1
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Fri Mar 26, 2010 7:15 pm Post subject: |
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| daj95376 wrote: | The W-Wing and fined X-Wing appear to be extraneous.
It appears to need a chain or an ALS, but they only get you past the bottleneck.
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I finally settled for a three candidate AIC:
(5=8)r5c1-(8=2)r6c3-(2)r5c2=(2)r5c8; r5c8<>5
As Danny said, this gets you past the bottleneck.
There is an xy-wing 18-12-28 later, and another one (54-48-85) near the end
I am not happy with those multi-candidate AICs.
Although I have a method to find three-candidate AICs by hand, it is a tedious process, not very satisfying  |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Fri Mar 26, 2010 8:19 pm Post subject: |
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The w-wing sets this up: | Code: | *--------------------------------------------------------------------*
| 578 2569 2789 | 238 358 2389 | 36 1 4 |
| 3 459 19 | 6 145 149 | 8 7 2 |
| 48 246 128 | 7 1348 12348 | 36 9 5 |
|----------------------+----------------------+----------------------|
| 1 359 389 | 348 2 7 | 459 6 89 |
| 58 2359 4 | 138 6 138 | 7 258 189 |
| 6 7 28 | 5 9 148 | 124 24 3 |
|----------------------+----------------------+----------------------|
| 2 8 5 | 1349 1347 6 | 149 34 179 |
| 47 34 37 | 1289 18 5 | 129 28 6 |
| 9 1 6 | 2348 3478 2348 | 245 23458 78 |
*--------------------------------------------------------------------*
(4)r4c4=(4-5)r4c7=r4c2-(5=2)[ALS:r5c1,r6c3]-(2=4)r6c8; r4c7,r6c6<>4
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Neat step but doesn't get you very far.
UPDATE: | Code: | *--------------------------------------------------------------------*
| 578 2569 2789 | 238 358 2389 | 36 1 4 |
| 3 459 19 | 6 145 149 | 8 7 2 |
| 48 246 128 | 7 1348 12348 | 36 9 5 |
|----------------------+----------------------+----------------------|
| 1 359 389 | 4 2 7 | 59 6 89 |
|a58 59-2 4 |a138 6 a138 | 7 a258 189 |
| 6 7 b28 | 5 9 b18 | 14-2 4-2 3 |
|----------------------+----------------------+----------------------|
| 2 8 5 | 139 1347 6 | 149 34 179 |
| 47 34 37 | 1289 18 5 | 129 28 6 |
| 9 1 6 | 238 3478 2348 | 245 23458 78 |
*--------------------------------------------------------------------*
ALS
a = 12358
b=128
x=1 b5
z=2
later you will need an xy-wing 458 to finish it up |
Ugly but what can I say! |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Fri Mar 26, 2010 9:06 pm Post subject: |
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There are a couple of short chains that then need an XY-wing and a UR to solve it.
Keith |
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