| View previous topic :: View next topic |
| Author |
Message |
Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
|
 Posted: Wed Oct 22, 2008 2:24 am Post subject: Oct 22 VH |
 |
|
1-2-7 xy-wing, BINGO !
Earl |
|
| Back to top |
|
 |
crunched
Joined: 05 Feb 2008
Posts: 168
|
| Posted: Wed Oct 22, 2008 5:04 am Post subject: Re: Oct 22 VH |
|
|
| Earl wrote: | 1-2-7 xy-wing, BINGO !
Earl |
Yep, it took me about 7-8 minutes for this easy vh puzzle. That means the wizards will have it resolved in prolly 30-40 seconds. |
|
| Back to top |
|
|
storm_norm
Joined: 18 Oct 2007
Posts: 1741
|
| Posted: Wed Oct 22, 2008 7:08 am Post subject: |
|
|
| pretty happy about this one. but again, like in some puzzles in the past, the placement of the xy-wing in the 8-9 box area probably caused an extra minute to locate. for some reason my eyes don't automatically jump to that part of the puzzle. |
|
| Back to top |
|
|
arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
|
| Posted: Wed Oct 22, 2008 11:59 am Post subject: |
|
|
| Code: | *-----------*
|.19|...|...|
|2.7|..9|...|
|.8.|16.|...|
|---+---+---|
|1.6|.7.|.4.|
|8..|...|..6|
|.4.|.3.|9.5|
|---+---+---|
|...|.45|.2.|
|...|9..|6.3|
|...|...|85.|
*-----------*
*-----------------------------------------------------------*
| 3456 1 9 | 247 25 2347 | 245 36 8 |
| 2 36 7 | 48 58 9 | 45 36 1 |
| 345 8 345 | 1 6 234 | 245 9 7 |
|-------------------+-------------------+-------------------|
| 1 9 6 | 5 7 8 | 3 4 2 |
| 8 35 35 | 24 9 24 | 17 17 6 |
| 7 4 2 | 6 3 1 | 9 8 5 |
|-------------------+-------------------+-------------------|
| 36 367 138 | 378 4 5 | 17 2 9 |
| 45 257 1458 | 9 128 27 | 6 17 3 |
| 9 237 13 | 237 12 6 | 8 5 4 |
*-----------------------------------------------------------*
|
Anyone see another solution? |
|
| Back to top |
|
|
Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
|
| Posted: Wed Oct 22, 2008 1:44 pm Post subject: Oct 22 VH |
|
|
Dan,
I can do it with two xy-chains, but that is not very elegant.
Earl |
|
| Back to top |
|
|
nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
|
| Posted: Thu Oct 23, 2008 7:32 pm Post subject: |
|
|
| arkietech wrote: |
Anyone see another solution? |
Dan,
I see another possibility, but not in the usual ("vh") x-,xy-,xyz-wing domain.
| Code: |
*-----------------------------------------------------------*
| 3456 1 9 | 247 25 2347 | 245 36 8 |
| 2 36 7 | 48 58 9 | 45 36 1 |
| 345 8 345 | 1 6 234 | 245 9 7 |
|-------------------+-------------------+-------------------|
| 1 9 6 | 5 7 8 | 3 4 2 |
| 8 35 35 | 24 9 24 | 17 17 6 |
| 7 4 2 | 6 3 1 | 9 8 5 |
|-------------------+-------------------+-------------------|
| 36 367 138 | 3-78 4 5 | 17 2 9 |
| 45 #257 1458 | 9 1-28 >27< | 6 17 3 |
| 9 #23*7 13 | 23*7 12 6 | 8 5 4 |
*-----------------------------------------------------------*
|
The bi-value cell r8c6 (marked > <) sees both a strong link on (2) in col 2 and a strong link on (7) in row 9. Both links are connected in cell r9c2.
This allows the elimination of 7 from r6c4 and 2 from r8c5.
With 2 gone from r8c5, that cell is now bi-value (1,8) and it sees the strong link (8) in col 3, which is connected (in r7c3) to a strong link (1) in row 7. This means r8c8 cannot be 1 and the puzzle is solved. |
|
| Back to top |
|
|
arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
|
| Posted: Thu Oct 23, 2008 8:20 pm Post subject: |
|
|
| nataraj wrote: | The bi-value cell r8c6 (marked > <) sees both a strong link on (2) in col 2 and a strong link on (7) in row 9. Both links are connected in cell r9c2.
This allows the elimination of 7 from r6c4 and 2 from r8c5.
With 2 gone from r8c5, that cell is now bi-value (1,8) and it sees the strong link (8) in col 3, which is connected (in r7c3) to a strong link (1) in row 7. This means r8c8 cannot be 1 and the puzzle is solved. |
Great Find! What do you call this? I assume you take a bivalue cell and look for strong connections to both values then look for candidates that see both the bivalue cell and the strong link. |
|
| Back to top |
|
|
keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
|
| Posted: Thu Oct 23, 2008 8:43 pm Post subject: |
|
|
| Quote: | | Anyone see another solution? |
No, but there is a 4-link XY-wing. <24> and <48> in C4 act like <28>. With <25> and <58> in C5 there is a wing that takes out <2> in R4C1. Not much help.
There is also (I believe) a <36> DP that I could find no use for.
Keith |
|
| Back to top |
|
|
nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
|
| Posted: Thu Oct 23, 2008 8:53 pm Post subject: |
|
|
I don't call it anything anymore 
(suggestions I have offered so far, but none really took off: hockey stick, Harvey Wallbanger)
Actually I look for strong links first (in the course of looking for x-wings, kites, skyscrapers etc.). When I realize that a bi-value cell "sees" such a strong link I check for a connected strong link in the other candidate.
The search is much easier when done with a little helping diagram (the actual drawing does not contain the red and green annotations):
 |
|
| Back to top |
|
|
daj95376
Joined: 23 Aug 2008
Posts: 3854
|
| Posted: Thu Oct 23, 2008 9:59 pm Post subject: |
|
|
| arkietech wrote: | | nataraj wrote: | The bi-value cell r8c6 (marked > <) sees both a strong link on (2) in col 2 and a strong link on (7) in row 9. Both links are connected in cell r9c2.
This allows the elimination of 7 from r6c4 and 2 from r8c5.
|
Great Find! What do you call this? |
It's a continuous nice loop: AIC
| Code: | 7-[r8c6]-2-[r8c2]=2=[r9c2]=7=[r9c4]-7-[r8c6]-2 => [r7c4]<>7, [r8c5]<>2, [r9c2]<>3
|
|
|
| Back to top |
|
|
Asellus
Joined: 05 Jun 2007
Posts: 865
Location: Sonoma County, CA, USA
|
| Posted: Thu Oct 23, 2008 10:34 pm Post subject: |
|
|
| As Danny has pointed out, that AIC loop also removes the <3> in r9c2. All 4 eliminations can also be seen as a Sue de Coq in cells r8c6|r9c345. |
|
| Back to top |
|
|
|
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
