Petrus Method

2019-10-31T15:31:12Z

Daedalus: /* The Steps */ usage errors with "permutate" and "orientate". And semi-parenthetical elaboration on step 2.

{{Method Infobox
|name=Petrus
|image=Petrus_method.gif
|proposers=[[Lars Petrus]]
|year=1981
|anames
|algs=2 to 493 (for the last layer)
|variants
|steps=7
|moves=~50
|purpose=<sup></sup>
* [[Fewest Moves]]
* [[Speedsolving]]
}}

{{Method Header
|listofsteps=[[2x2x2 Block]] -> [[2x2x3 Block]] -> [[EO Petrus]] -> [[Petrus F2L]] -> [[LL+EO:CP]] -> [[LL+EO+CP:CO]] -> [[EPLL]]
|description='''Petrus''' was the second most popular speedcubing method behind [[CFOP]].
}}

The '''Petrus Method''', invented by [[Lars Petrus]], is a block-building [[method]] where the [[F2L]] is solved intuitively with no [[algorithm]]s. Petrus was the second most popular speedcubing method behind [[Fridrich]]/[[CFOP]]; however other methods like [[ZZ]] and [[Roux]] are currently more popular.

The Petrus Method is sometimes partially used in [[CFOP]] solves for [[XCross]].

== The Steps ==
The following steps describe an approach suited for beginners, more advanced users might combine steps 1 and 2 and/or 5 and 6 ([[COLL]]) or use a [[Fridrich]] type last layer and do [[OLL]] and then [[PLL]]. If the fifth step is skipped the last layer can be solved with a [[2GLL]] algorithm.

1. Build a [[2x2x2 block]] anywhere on the cube.

2. Expand the [[2x2x2 block]] to a [[2x2x3 block]]; three ways are possible for each initial [[2x2x2 block]] placement.

3. Fix the "bad edges" (in other words, orient the remaining seven edges on the cube that have not been solved).

4. Finish the First Two Layers (F2L) by only turning 2 sides. 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; two ways are possible. The last-layer edges will orientate themselves automatically.

5. Permute the last-layer corners (put them in their correct places).

6. Orient the last-layer corners, making the whole last layer a solid colour.

7. Permute the last layer edges, without disturbing the other pieces, to solve the cube.

== Pros ==

* The Petrus Method uses fewer moves than the [[Fridrich]] method and most, if not all, other non-block-building methods.
* It is more intuitive than the Fridrich method, and it requires far fewer algorithms.
* It requires fewer algorithms than some beginner methods (including the most popular one: [[Layer By Layer]]).
* If [[COLL]] is used as well, one can orient and permute the corners at the same time.
* 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.

* Due to the high amount of intuition, it is difficult to optimize finger tricks during the block building stage.

* Recognition in the Edge Orientation step tends to result in long pauses.

== Petrus variations ==

There are several other [[substep]]s that can be used [[EJLS]], [[WV]], [[COLL]], 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:3x3x3 methods]]
[[Category:3x3x3 beginner methods]]
[[Category:3x3x3 speedsolving methods]]
[[Category:Fewest Moves Methods]]

Petrus Method

2019-10-31T15:20:11Z

Daedalus: /* Pros */ Grammar error orientate/permutate to orient/permute

{{Method Infobox
|name=Petrus
|image=Petrus_method.gif
|proposers=[[Lars Petrus]]
|year=1981
|anames
|algs=2 to 493 (for the last layer)
|variants
|steps=7
|moves=~50
|purpose=<sup></sup>
* [[Fewest Moves]]
* [[Speedsolving]]
}}

{{Method Header
|listofsteps=[[2x2x2 Block]] -> [[2x2x3 Block]] -> [[EO Petrus]] -> [[Petrus F2L]] -> [[LL+EO:CP]] -> [[LL+EO+CP:CO]] -> [[EPLL]]
|description='''Petrus''' was the second most popular speedcubing method behind [[CFOP]].
}}

The '''Petrus Method''', invented by [[Lars Petrus]], is a block-building [[method]] where the [[F2L]] is solved intuitively with no [[algorithm]]s. Petrus was the second most popular speedcubing method behind [[Fridrich]]/[[CFOP]]; however other methods like [[ZZ]] and [[Roux]] are currently more popular.

The Petrus Method is sometimes partially used in [[CFOP]] solves for [[XCross]].

== The Steps ==
The following steps describe an approach suited for beginners, more advanced users might combine steps 1 and 2 and/or 5 and 6 ([[COLL]]) or use a [[Fridrich]] type last layer and do [[OLL]] and then [[PLL]]. If the fifth step is skipped the last layer can be solved with a [[2GLL]] algorithm.

1. Build a [[2x2x2 block]] anywhere on the cube.

2. Expand the [[2x2x2 block]] to a [[2x2x3 block]]; three ways are possible.

3. Fix the "bad edges" (in other words, orientate the remaining seven edges on the cube that have not been solved).

4. Finish the First Two Layers (F2L) by only turning 2 sides. 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; two ways are possible. The last-layer edges will orientate themselves automatically.

5. Permutate the last-layer corners (put them in their correct places).

6. Orientate the last-layer corners, making the whole last layer a solid colour.

7. Permutate the last layer edges, without disturbing the other pieces, to solve the cube.

== Pros ==

* The Petrus Method uses fewer moves than the [[Fridrich]] method and most, if not all, other non-block-building methods.
* It is more intuitive than the Fridrich method, and it requires far fewer algorithms.
* It requires fewer algorithms than some beginner methods (including the most popular one: [[Layer By Layer]]).
* If [[COLL]] is used as well, one can orient and permute the corners at the same time.
* 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.

* Due to the high amount of intuition, it is difficult to optimize finger tricks during the block building stage.

* Recognition in the Edge Orientation step tends to result in long pauses.

== Petrus variations ==

There are several other [[substep]]s that can be used [[EJLS]], [[WV]], [[COLL]], 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:3x3x3 methods]]
[[Category:3x3x3 beginner methods]]
[[Category:3x3x3 speedsolving methods]]
[[Category:Fewest Moves Methods]]

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Petrus Method

Petrus Method