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Brainbasher super hard 8/9/08

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arkietech

Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA

Posted: Sun Aug 10, 2008 6:57 pm Post subject: Brainbasher super hard 8/9/08

After encountering an x-wing and swordfish I wound up here on today's Brainbasher Super Hard

Code:

.2.....7.3.7.2.4.64.6...9.2...6.7.....92.83.....4.5...2.3...8.17.8.6.2.4.4.....6.
*-----------------------------------------------------------*
|*89 2 1 | 389 4 6 | 5 7 *38 |
| 3 589 7 | 158 2 19 | 4 18 6 |
| 4 58 6 | 1578 57 13 | 9 138 2 |
|-------------------+-------------------+-------------------|
| 5 3-8 4 | 6 39 7 | 1 2 *89 |
| 6 7 9 | 2 1 8 | 3 4 5 |
|*18 138 2 | 4 39 5 | 6 89 7 |
|-------------------+-------------------+-------------------|
| 2 6 3 | 579 57 4 | 8 59 1 |
| 7 19 8 | 15 6 139 | 2 35 4 |
| 19 4 5 | 139 8 2 | 7 6 39 |
*-----------------------------------------------------------*

I solved it with a skyscraper as shown. I am really into W and M wings. I know there is something here on (89) Help! Confused

storm_norm

Joined: 18 Oct 2007
Posts: 1741

Posted: Sun Aug 10, 2008 7:51 pm Post subject:

Code:

.2.|...|.7.
3.7|.2.|4.6
4.6|...|9.2
---+---+---
...|6.7|...
..9|2.8|3..
...|4.5|...
---+---+---
2.3|...|8.1
7.8|.6.|2.4
.4.|...|.6.

Code:

.---------------------.---------------------.---------------------.
| 89 2 15 | 389 4 6 | 15 7 38 |
| 3 1589 7 | 1589 2 19 | 4 158 6 |
| 4 158 6 | 13578 578 13 | 9 1358 2 |
:---------------------+---------------------+---------------------:
| 158 1358 4 | 6 39 7 | 15 2 589 |
| 6 57 9 | 2 1 8 | 3 4 57 |
| 18 1378 2 | 4 39 5 | 6 189 789 |
:---------------------+---------------------+---------------------:
| 2 6 3 | 579 57 4 | 8 59 1 |
| 7 159 8 | 1359 6 139 | 2 359 4 |
| 159 4 15 | 13589 58 2 | 7 6 359 |
'---------------------'---------------------'---------------------'

I think the x-wings and the swordfish might be the way to go. after the swordfish is a xy-wing on {3,8,9} stretching from corner to corner eliminating the 9 in r9c1

Last edited by storm_norm on Sun Aug 10, 2008 8:38 pm; edited 1 time in total

nataraj

Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria

Posted: Sun Aug 10, 2008 8:33 pm Post subject: Re: Brainbasher super hard 8/9/08

arkietech wrote:

I know there is something here on (89) Help! Confused

I could suggest an xy-wing:
all 4 corners, 89-38-39. It has a "89" in it, AND

it could be viewed as a (generalized) m-wing:

if r9c9 is not 9, then r1c9=8, r1c4=3. But then r1c1=9.

Same elimination but viewed as a m-wing (9) from the other end:

if r1c1=8 then r4c9=8 then r9c9=9. this one uses both 89's Smile

arkietech

Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA

Posted: Sun Aug 10, 2008 9:51 pm Post subject:

Someday I will get a handle on the W and M-wings. I was looking so hard for the w-wing I missed the xy-wing altogether. Thanks for your help

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