Help with Petrus Step 6 Targeting... different than OLL ??

[RadStar]

Heya Guys,

I need some help understanding Petrus' Step 6 Targeting rule..

It seems to be different than OLL somehow? The move sequence is exactly the same (R,U,Ri,U,R,U2,Ri) but it says it should always succeed by doing this only once or twice...

When I do it- sometimes I have to do it a 3rd time to complete it.. so this tells me that I am doing the targeting incorrectly..

Can someone please rephrase the below explaination for me? Im just not getting it at all... especially the (b) rule??

Many thanks guys!!!
Roger

http://www.lar5.com/cube/fas6.html

To talk about how to use Sune™ we need to define the concept the Sune™'s target. The target of a Sune™ in the example is the yellow sticker. In words, the target is the sticker on the corner opposite the side of the first Sune™ turn that is left untwisted. Or in other words, the first turn of a Sune™ targets the sticker that (a) is on the opposite side from the side of the first turn, and (b) of the two corner stickers there, it targets the one on the side that is turned up.

Once you've understood the target concept, you only have these three rules to keep in mind. If the final layer is red...

* ...with no correct corners, target a red sticker. This leaves one correct corner.
* ...with one correct corner, target like the animation on the top of page.
* ...with two correct corners, target a non red sticker of an incorrectly twisted corner. This leaves one correct corner.

 

[brunson]

<joke>You're doing it wrong.</joke>

Seriously, though... Here's how I thought about it when I was a Petrus beginner: There are really two starting situations. 1) You are in a Sune postion, 2) You are not. If you're set up for Sune, then execute it, if not, then you're going to have to try to get your corners into Sune.

Lars talks about targeting different stickers and has used the specific colors that he's done the setups to accomodate. Back then my brain didn't think that way, so I simply looked at how the Sune was going to twist the corners.

Don't try to memorize anything from his page, just look at the LL and know that when you do a Sune it's going to twist the corners at BL, BR and FR in a counter clockwise direction. So, adjust the upper face (AUF) and look at how Sune is going to affect your corners. There will always be one of the 4 up positions that will lead to a Sune. It may require an additional AUF between the first and seconds Sunes, but it's always there.

When you figure it out enough on your own, you'll start recognizing them and moving directly to the correct U face position.

 

[RadStar]

Ok thanks for the help. Thats a good tip- to see what changes happen and process it in my head that way.

What is an AUF?

 

[Scigatt]

Heya Guys,

I need some help understanding Petrus' Step 6 Targeting rule..

It seems to be different than OLL somehow? The move sequence is exactly the same (R,U,Ri,U,R,U2,Ri) but it says it should always succeed by doing this only once or twice...

When I do it- sometimes I have to do it a 3rd time to complete it.. so this tells me that I am doing the targeting incorrectly..

Can someone please rephrase the below explaination for me? Im just not getting it at all... especially the (b) rule??

Many thanks guys!!!
Roger

http://www.lar5.com/cube/fas6.html

To talk about how to use Sune™ we need to define the concept the Sune™'s target. The target of a Sune™ in the example is the yellow sticker. In words, the target is the sticker on the corner opposite the side of the first Sune™ turn that is left untwisted. Or in other words, the first turn of a Sune™ targets the sticker that (a) is on the opposite side from the side of the first turn, and (b) of the two corner stickers there, it targets the one on the side that is turned up.

Once you've understood the target concept, you only have these three rules to keep in mind. If the final layer is red...

* ...with no correct corners, target a red sticker. This leaves one correct corner.
* ...with one correct corner, target like the animation on the top of page.
* ...with two correct corners, target a non red sticker of an incorrectly twisted corner. This leaves one correct corner.

Do you know how to do mirror Sune or anti-Sune? If you have those you can always do it in two.

 

[Rabid]

Lars' explanation confused the crud out of me too. I was looking at some Sunes today and still can't quite grasp the twisting concept. But I don't need to. I just recognize the case and apply.

 

[RadStar]

Lars' explanation confused the crud out of me too. I was looking at some Sunes today and still can't quite grasp the twisting concept. But I don't need to. I just recognize the case and apply.

Apply what?

 

[Rabid]

Lars' explanation confused the crud out of me too. I was looking at some Sunes today and still can't quite grasp the twisting concept. But I don't need to. I just recognize the case and apply.

Apply what?

The Sune or anti-Sune alg.

I found the orientation on his java weird..not intuitive to the algs at all. I had to dig to find a decent site that didn't make me guess a few cases to "teach me a lesson".

A Sune or anti-Sune fixes 3 corners, once you recognize the orientation of the case you can always solve in 2 algs max.

 

[brunson]

Ok thanks for the help. Thats a good tip- to see what changes happen and process it in my head that way.

What is an AUF?

adjust the upper face (AUF)

Adjust Upper Face.

 

[RadStar]

Ok thanks alot guys.

AUF- Adjust Upper Face, ok great now i know

Is there a list of all the acroymn's somewhere?

 

[Kenneth]

Why not abandon the Sunes and learn separate algs for all situations, it is only seven of them and the algs are short.

Look att OLL, all edges correct to find the algs.

 

[RadStar]

man thats a really good tip since the edges are all correct.

Ive been doing Rubiks for a week now and know how to follow algorithims on other sites... but that site confuses me

why are there so many lines? have to do all? or just the first one?

what does "y" mean?

 

[Kenneth]

There are more lines than one because there are alternative algorithms, you can pick the one that suits you the most. As a newbie you shall concentrate on the one that you find easiest, advanced cubers goes for the ones they can execute the fastest.

y is a cube orientation, it means you shall rotate the whole cube around the y-axis (same as a U-turn but the whole puzzle rotates)

There are also x (as R) and z (as F) turns.

Here you can read about the notation.

 

[Rabid]

There are more lines than one because there are alternative algorithms, you can pick the one that suits you the most. As a newbie you shall concentrate on the one that you find easiest, advanced cubers goes for the ones they can execute the fastest.

I would think as a newbie it's more productive to just learn the orientation for the Sunes. Even I can slog through a couple in about a second.

 

[JLarsen]

There are more lines than one because there are alternative algorithms, you can pick the one that suits you the most. As a newbie you shall concentrate on the one that you find easiest, advanced cubers goes for the ones they can execute the fastest.

I would think as a newbie it's more productive to just learn the orientation for the Sunes. Even I can slog through a couple in about a second.

Awesome you're going for Petrus, as for learning algs for the last layer all ready, I wouldn't. I had about an 10 second last layer and a freakin 25 or so f2l for too long. Just now is my f2l finnaly catching up, after about 4 months. I have about a 17 f2l now. The lesson to be learned is work more on your f2l than your last layer, and get somewhat fast before learning the seven OLL's and 21 PLL's, but do learn them at some point. They do help a ton.

 

[Rabid]

The lesson to be learned is work more on your f2l than your last layer, and get somewhat fast before learning the seven OLL's and 21 PLL's, but do learn them at some point. They do help a ton.

Doesn't Petrus only use the 4 EPLL algs if you are using the OLL's?

 

[Kenneth]

The lesson to be learned is work more on your f2l than your last layer, and get somewhat fast before learning the seven OLL's and 21 PLL's, but do learn them at some point. They do help a ton.

Doesn't Petrus only use the 4 EPLL algs if you are using the OLL's?

No, that is if you are using COLL (42 cases)

 

[ImNOTnoob]

hey, doesnt the fridrich finish for the petrus method uses less algs? Id expect it to be around the same speed too.

 

[JLarsen]

hey, doesnt the fridrich finish for the petrus method uses less algs? Id expect it to be around the same speed too.

Trust me DON'T use the Petrus Finish. You would think it's faster but recognition is pretty bad. The algs also are not very pretty, I mean they're not even remotely finger friendly. Perfect example Eric Johnson average below 14 with Petrus and he, like me, uses OLL PLL. And yes, OLL PLL takes less algs, 21 PLL's and 7 Oll's. that's 28. COLL uses over 50, and the 4 EPLL algs.