Fridrich Method

The CFOP (Cross - F2L - OLL - PLL) system, simply known as the Fridrich Method is one of the most commonly used methods in speedsolving a Rubik's Cube. This method was first developed in the early 1980s by Jessica Fridrich, and was published online in 1997.^[1]

The method works on a layer-by-layer system, first "solving" a cross on the bottom, continuing to solve the first two layers (F2L), orienting the last layer (OLL), and finally permuting the last layer (PLL).

The method

Cross solved. (View from Bottom)

First Two Layers solved

Orientation of the Last Layer complete

The method consists of 4 steps:

• The Cross - This first stage involves solving four edge pieces on one side. By convention, the side most widely used by speedcubers is white. This step is the most intuitive step of the solve but it is also very fast; Experienced speedcubers can solve it in about 2–3 seconds, and in all cases it requires 8 or fewer turns to solve.

• Solve the First Two Layers (F2L) - This stage consumes most of the time as it has the most turns to solve. In most beginner methods, the corners of the cube and edge pieces are solved separately. In F2L, both the corner piece and edge pieces are solved at the same time, reducing the number of twists needed. There are 42 different cases for F2L, 41 plus the already solved case. However, many speedcubers solve this step intuitively.

• Orientation of Last Layer (OLL) - This stage involves manipulating the top layer so that all 9 cubes on the top side are the same color, even at the expense of incorrect colors on other sides. This stage involves learning a total of 57 algorithms.

• Permutation of Last Layer (PLL) - The final stage involves moving the pieces of the top layer while preserving their orientation. There are a total of 21 algorithms for this stage.

Tournament use

The Fridrich Method is used by many speedcubers, for example Rowe Hessler, Feliks Zemdegs and Erik Akkersdijk. The Fridrich Method is commonly preferred for speedcubing because it relies heavily on algorithms as opposed to more intuitive methods such as Roux or Petrus. By not being intuitive it makes the solver rely only on pattern recognition and muscle memory. The majority of top speed cubers on the WCA ranking list are Fridrich solvers.^[2]

External links

• Jessica Fridrich's official site
• Description of the Fridrich Method
• Cubewhiz List of OLL and PLL algorithms
• Cubezone List of OLL and PLL algorithms
• Joel's List of OLL and PLL algorithms

References

1. ^ Shotaro "Macky" Makisumi. "Speedcubing". cubefreak.net. Archived from the original on 2007-07-03. http://web.archive.org/web/20070703151003/http://www.cubefreak.net/speedcubing.html. Retrieved 2007-08-31. 
2. ^ http://www.worldcubeassociation.org/results/events.php

This puzzle/logic game-related article is a stub. You can help Wikipedia by expanding it.v · Categories: Rubik's Cube Game stubs Wikimedia Foundation. 2010. Игры ⚽ Поможем написать реферат Shipton, North Yorkshire Newton-on-Ouse Look at other dictionaries: Fridrich method — noun A method of solving the Rubiks Cube in which one starts with a cross, then finishes the F2L, then does OLL and PLL. Syn: CFOP …   Wiktionary Jessica Fridrich — This article is about the person Jessica Fridrich. For the speedsolving method of a rubik s cube, see Fridrich Method. Jessica Fridrich is the inventor of the most commonly used method for speed solving the Rubik s Cube, better known as… …   Wikipedia Speedcubing — (also known as speedsolving, speed cubing or speed cubing) is the activity of solving a Rubik s Cube or related puzzle as quickly as possible. Here, solving is defined as performing a series of moves that transforms an incomplete cube into a… …   Wikipedia Tyson Mao — (born May 8, 1984 in San Francisco, California), is one of the world s top competitive Rubik s Cube solvers. He is known especially for his prominence in the 3x3x3 blindfold Rubik s Cube category where, as of September 29th, 2008, he ranks 26th… …   Wikipedia Speedcubing — Erik Akkersdijk löst den 3×3×3 Würfel innerhalb von 10,50 Sekunden Speedcubing Speedcubing (von englisch speed …   Deutsch Wikipedia Bob Burton, Jr. — Infobox Monarch | name=Robert Russell Burton, Jr. title=American Speedcuber date of birth= birth date and age|1985|2|21 place of birth= Newark, New JerseyBob Burton (born Robert Russell Burton, Jr. on February 21, 1985) is an American speedcuber …   Wikipedia Digital watermarking — An image with visible digital watermarking the text Brian Kell 2006 is visible across the center of the image Digital watermarking is the process of embedding information into a digital signal which may be used to verify its authenticity or the… …   Wikipedia Rubik's Cube — Other names Magic Cube …   Wikipedia Digitale Bildforensik — ist eine Teildisziplin der digitalen Multimediaforensik und widmet sich der Untersuchung der Authentizität digitaler Bilder unter anderem zur Gewinnung von Indizien in der Kriminalistik (vgl. Forensik). Bei den meisten in der Praxis relevanten… …   Deutsch Wikipedia Intubation — In medicine, intubation refers to the placement of a tube into an external or internal orifice of the body. Although the term can refer to endoscopic procedures, it is most often used to denote tracheal intubation. Tracheal intubation is the… …   Wikipedia 18+ © Academic, 2000-2024 Contact us: Technical Support, Advertising Dictionaries export, created on PHP, Joomla, Drupal, WordPress, MODx. Mark and share Search through all dictionaries Translate… Search Internet Share the article and excerpts Direct link … Do a right-click on the link above and select “Copy Link”