Petrus Method

2010-08-17T18:10:56Z

Rebeca345:

{{Method Infobox
|name=Petrus
|image=Petrus_method.gif
|proposers=[[Lars Petrus]]
|year=1981
|anames
|variants
|steps=7
|moves=45 to 60
|purpose=<sup></sup>
* [[Fewest Moves]]
* [[Speedsolving]]
}}
The '''Petrus Method''', invented by [[Lars Petrus]], is a block-building [[method]] where the [[F2L]] is solved intuitively with no [[algorithm]]s. Behind [[Fridrich]], it is currently the second most popular speed cubing method in use.

== The Steps ==

1. First, build a [[2x2x2 block]] anywhere on the cube.

2. Next, you expand the 2x2x2 block to a [[2x2x3 block]].

3. After that, you fix the "bad edges" or orient the remaining seven edges on the cube that have not been solved.

4. Then, you finish the First Two Layers (F2L). The pure Petrus approach is to create a 1x2x2 block and expand it to a 1x2x3 block to finish off the F2L, not to solve the cross piece and two corner/edge pairs.

5. Next, you permute the last layer corners, or put them in their proper places (they do not have to be oriented.)

6. Now, you orient the last layer corners, making the whole last layer a solid color.

7. Finally, you permute the last layer edges, without disturbing anything else, to solve the cube.

8.[http://www.superiorpapers.com custom term papers]
== Pros ==

The Petrus Method uses fewer moves than the [[Fridrich]] method and most other non-block-building methods. It is more intuitive than the Fridrich method, and it requires far less algorithms. The last layer can even be solved in one look with [[ZBLL]] or [[ZZLL]], however this drastically increases the number of algorithms one must learn.

== Cons ==

It can be sometimes hard (especially for a beginner) to optimize block building, and it's difficult to keep consistently turning throughout the solve.

== Petrus variations ==

There are several other [[sub step|substeps]] that can be used [[EJLS]], [[WV]], [[COLL]], [[JSLS]], and [[ZBLL]], which completes the entire last layer in a single algorithm.

== Petrus as a Beginner Method ==
Used as a beginner method, Petrus requires much more intuition, but also involves learning fewer algorithms. For a tutorial, see the external links below.

== External Links ==

* [http://lar5.com/cube/ Lars Petrus's tutorial]
* [http://petrus-speed.netne.net/ Petrus Speed Website]
* Speedsolving.com [http://www.speedsolving.com/forum/showthread.php?t=14014 YouTube Beginner Petrus Tutorial]
* YouTube: [http://www.youtube.com/watch?v=EQ9OrFVQw0o Petrus Tutorial] by fallofshadows
* YouTube: [http://www.youtube.com/watch?v=WqXdO2H2FTs Petrus Tutorial] by CuberChris

[[Category:Methods]]
[[Category:3x3x3 Methods]]
[[Category:3x3x3 Beginner Methods]]
[[Category:3x3x3 Speedsolving Methods]]
[[Category:Fewest Moves Methods]]

Speedsolving.com Wiki - User contributions [en]

Petrus Method