SPEEDCUBING (also known as SPEEDSOLVING) is the activity of solving a variety of twisty puzzles , the most famous being the Rubik\'s Cube , as quickly as possible. For most puzzles, solving entails performing a series of moves that alters a scrambled puzzle into a state in which every face of the puzzle is a single, solid color. Some puzzles have different requirements to be considered solved, such as the Clock , for which all the dials must be moved into the 12 'o clock position.
The standard puzzle sizes are 2×2×2 , 3×3×3 , 4×4×4 , 5×5×5 , 6×6×6 , and 7×7×7 , although variations of the puzzle have been designed with as many as 22 layers, albeit not mass-produced for the public. There are also different shapes of the famous puzzles, including Pyraminx, Megaminx, Skewb, and Square-1. The world record for a single 3x3x3 solve is 4.59 seconds,set by Korean SeungBeom Cho (조승범) in the first round of the ChicaGhosts 2017 competition on October 28, 2017 Chicago, Illinois USA. Feliks Zemdegs holds the average of five 3x3x3 solves world record of 5.80 seconds, set at the Malaysia Cube Open 2017 competition held on 14-15 October 2017.
* 1 History
* 2 Solving methods
* 2.1 CFOP method * 2.2 Roux method * 2.3 ZZ method * 2.4 Petrus method * 2.5 Corners-first methods
* 3 Competitions
* 3.1 World Cube Association * 3.2 Format * 3.3 World Rubik\'s Cube Championships
* 4 World records * 5 Lubrication * 6 Terminology * 7 See also * 8 References * 9 External links
The Rubik\'s Cube was invented in 1974 by Hungarian professor of
The standard 3x3x3 can be solved using a number of methods, not all of which are intended for speedcubing. Although some methods employ a layer-by-layer system and algorithms, other significant (though less widely used) methods include corners-first methods and the Roux method. CFOP , Roux, ZZ, and Petrus are often referred to as the "big four" methods, as they are the most popular and can be used to achieve faster times than the others. The CFOP method is used by most speedcubers.
Main article: CFOP Method
The CFOP (Cross - F2L - OLL - PLL) method, also known as the Fridrich Method , was named after one of its inventors, Jessica Fridrich , who finished second in the 2003 Rubik's Cube World Championships. While it is known as the Fridrich method, its origins are actually credited to David Singmaster, who was one of the first to publish a layer by layer method of solving in 1980, and Guus Razoux Schultz, who built upon this and developed a more efficient system for the first two layers (F2L). Jessica Fridrich then finished developing the method and published it online in 1997, an event that was very influential in the revival of competitive speedcubing. The first step of the method is to solve a cross-shaped arrangement of edge pieces on the first layer. The remainder of the first layer and all of the second layer are then solved together in what are referred to as "corner-edge pairs" or slots. Finally, the last layer is solved in two steps — first, all of the pieces in the layer are oriented to form a solid color (but without the individual pieces always being in their correct places on the cube). This step is referred to as orientation and is usually performed with a single set of algorithms known as OLL (Orientation of Last Layer). Then, all of those pieces are permuted to their correct spots. This is also usually performed as a single set of algorithms known as PLL ( Permutation of Last Layer).
The CFOP method can be used as a less-advanced method by dividing the steps into more steps, reducing the number of algorithms you need to learn but sacrifices time. Most people start learning CFOP with 4LLL (Four-Look Last Layer), which is the less advanced, slower, and algorithm-reducing way to learn CFOP. The 4 steps are divided into Edge Orientation, Corner Orientation, Corner Permutation, and Edge Permutation. Later on, you can learn Full PLL which replaces the permutation of the edges and corners, making the solve more efficient and therefore faster. Even later, you can learn Full OLL which will replace the Orientation of the corners and edges, again making the solve faster.
The CFOP method is a widely used speedcubing method. Its popularity stems from the speed at which it can be easily performed. Many advanced speedcubers such as World Champion Feliks Zemdegs have also learned additional sets of algorithms for the last layer, such as Corners of Last Layer (COLL), which orients and permutes the corners when the edges are oriented.
The Roux method was invented by French speedcuber Gilles Roux . The first step of the Roux method is to form a 3×2×1 block usually placed in the lower portion of the left layer. The second step is to create another 3×2×1 on the opposite side, such that each block is sharing a bottom color. The remaining four corners are then solved using a set of algorithms known as CMLL (Corners of the Last Layer, without regard to the M-slice), which leaves six edges and four centers that are solved in the last step, L6E or LSE (Last Six Edges).
This method is not as dependent on algorithm memorization as the CFOP method , since all but the third step is done with intuition as opposed to predefined sets of algorithms. The Roux method can be performed without rotations (unlike the CFOP method) which means it is easier to look ahead (solving a collection of pieces while at the same time looking for the solution to the next step) while solving.
The ZZ method, short for Zbigniew Zborowski, is a modern speedcubing method originally proposed by Zbigniew Zborowski in 2006. The method was designed specifically to achieve high turning speed by focusing on move ergonomics, and is the combination of a block-building method and a layer-by-layer method. The initial pre-planned step is called EOLine, and is the most distinctive hallmark of the ZZ method. It involves orienting all edges while placing two oppositely placed down-face edges aligned with the correspondingly colored center. The next step solves the remaining first two layers using only left, right, top and bottom face turns, one of the advantages of ZZ. On completion of the first two layers, the last layer's edges are all correctly oriented because of edge pre-orientation during EOLine. The last layer may be completed using a number of techniques including those used in the CFOP method . An expert variant of this method (ZZ-a) allows the last layer to be completed in a single step with an average of just over 12 moves and knowledge of at least 494 algorithms.
The Petrus method, named after its inventor Lars Petrus , is considered to be more intuitive than the structured CFOP method . The first step of the Petrus method is to solve a 2×2×2 block of the cube. This block is then extended to a solved 2×2×3 block. All edges that are unoriented are then oriented, and then the first and second layers are completed using only turns of the right layer and the upper layer. Next, the top corners are put in the right place and the layer is oriented correctly (all stickers facing up) and finally the last edges are permuted (moved around). Lars Petrus developed this method to address what he felt were inherent inefficiencies in layer-by-layer approaches. This method is often used as the basis of a method for fewest moves competitions.
Corners-first methods involve solving the corners then finishing the edges with slice turns. Corners-first solutions were common in the 1980s, and was one of the most popular methods that 1982 world champion Minh Thai used. Currently corners-first solutions are less common among speedsolvers. Dutch cuber Marc Waterman created a corners-first method in the cube craze, and averaged 18 seconds in the mid-late 1980s.
Anssi Vanhala solving a 3×3×3 Rubik's Cube with his feet in 36.72 seconds, at the 2009 Estonian Open.
WORLD CUBE ASSOCIATION
Since 2003, speedcubing competitions have been held regularly. The World Cube Association (WCA) was formed in 2004 to govern all official competitions. For a competition to be official, it must be approved by the WCA and follow the WCA regulations. Included in the regulations is the necessity of having one or more WCA delegate in attendance. A delegate's main role is to ensure all regulations are followed during the competition. Once the competition has finished, the results are uploaded on to the WCA website .
The majority of puzzle competitions are held using an average of 5 format. This involves the competitor solving 5 times in the round; the fastest and slowest solve are disregarded and the mean of the remaining 3 is used. The 6×6×6, 7×7×7 and 3×3×3 with feet events are ranked by mean of 3. This is the same but only three solves are done, and no solves are disregarded when calculating the mean. 3×3×3 blindfolded and fewest moves challenge are held either by mean of 3 or best of 3. 4×4×4 blindfolded, 5×5×5 blindfolded and multiple blindfolded are held using best of 1, 2 or 3, depending on the competition. Occasionally an event is held using an uncommon format, for example best of 3 for 3×3×3.
When a round begins, competitors hand in the puzzle they will use. Puzzles are scrambled using a computer-generated scramble. Each round, five, three or one (depending on the format, mentioned above) scrambles are used. Every competitor in the round will receive each scramble once. Before starting a solve, a competitor has up to 15 seconds to inspect the puzzle (inspection is removed for blindfolded events). This is monitored by a judge with a stopwatch. Once the solve is complete, the judge records the time on the competitor's scorecard and it is signed by both. If the puzzle is unsolved and the timer is stopped, the time is recorded as "DNF" (Did Not Finish). There are also numerous reasons why the solve can receive a two-second addition to the solve time, such as a face being more than 45 degrees off, or the competitor going over the allowed inspection time. A competitor can also receive an extra solve to replace the one just completed, for example having a timer malfunction or being deliberately distracted by another person.
The official timer used in competitions is the StackMat timer . This device has touch-sensitive pads that are triggered by the user lifting one or both of their hands to start the time and placing both their hands back on the pads after releasing the puzzle to stop the timer.
Official competitions are currently being held in several categories.
CATEGORY CUBE TYPE
Speedsolving 2×2×2 , 3×3×3 , 4×4×4 , 5×5×5 , 6×6×6 , 7×7×7
Blindfolded solving 3x3x3, 4x4x4, 5x5x5
Multiple blindfolded solving 3x3x3
One-handed solving 3x3x3
Solving with feet 3x3x3
Solving in fewest moves 3x3x3
Speedsolvers solving Megaminxes at the 2011 Estonian Open.
Competitions will often include events for speedsolving these other puzzles, as well:
WORLD RUBIK\'S CUBE CHAMPIONSHIPS
The WCA organizes the World
Rubik's Cube Championship as the main
international competition once every two years. The latest
championship was held in
CHAMPIONSHIP YEAR HOST DATE(S) NATIONS PUZZLES EVENTS WINNER WINNING TIME(S) REF
III 2005 Lake Buena Vista 5–6 November 16 9 15 Jean Pons 15.10
V 2009 Düsseldorf 9–11 October 32 12 19 Breandan Vallance 10.74
VII 2013 Las Vegas 26–28 July 35 10 17 Feliks Zemdegs 8.18
The following are the official speedcubing world records approved by the WCA .
Note: For averages of 5 solves, the best time and the worst time are dropped, and the mean of the remaining 3 solves is taken. When only 3 solves are done, the mean of all 3 is taken.
EVENT TYPE RESULT (MIN:SEC.100THS) PERSON COMPETITION (DATE(S)) RESULT DETAILS (MIN:SEC.100THS)
3×3×3 Single 00:04.59 SeungBeom Cho ChinaGhosts 2017 (28 October) —
Average 00:05.80 Feliks Zemdegs Malaysia Cube Open 2017 00:05.99 / 00:05.28 / 00:05.25 / 00:06.13 / 00:09.19
Average 00:23.03 Sebastian Weyer German Big Cube Open 2017 (1–2 July) 00:20.66 / 00:34.08 / 00:22.75 / 00:22.55 / 00:23.79
5×5×5 Single 00:38.52 Feliks Zemdegs World Championship 2017 (13-16 July) —
Average 00:43.21 Feliks Zemdegs Melbourne Cube Days 2017 00:42.24 / 00:53.93 / 00:42.02 / 00:42.66 / 00:44.74
6×6×6 Single 01:20.03 Feliks Zemdegs World Championship 2017 (13-16 July) —
Mean 01:27.79 Feliks Zemdegs World Championship 2017 (13-16 July) 01:28.00 / 01:35.33 / 01:20.03
7×7×7 Single 02:06.73 Feliks Zemdegs World Championship 2017 (13-16 July) —
Mean 02:14.04 Feliks Zemdegs China's 10th Anniversary 2017 (1-2 October) 02:25.38 / 02:09.35 / 02:07.39
LatAm Tour -
Mean 00:22.67 Ishaan Agrawal 6.25 Bay Area 2017 (24–25 June) 00:22.67 / 00:24.14 / 00:21.21
3×3×3 Fewest Moves Single 19 Tim Wong Irvine Fall 2015 (11 October) —
Marcel Peters Cubelonia 2016 (9–10 January) —
Vladislav Ushakov PSU Open 2016 (27–28 August) —
Mean 24.00 Sébastien Auroux Only FMC 2017 (26 August) 23 / 26 / 23
Average 00:10.21 Feliks Zemdegs Malaysia Cube Open 2017 00:10.28 / 00:10.04 / 00:10.31 / 00:09.01 / 00:11.24
3×3×3 with Feet Single 00:20.57 Jakub Kipa Radomsko Cube Theory 2015 (27–28 June) —
Mean 00:28.16 Jakub Kipa Mielec Cube Day 2016 (11–12 June) 00:32.86 / 00:21.83 / 00:29.79
Juan Pablo Huanqui
LatAm Tour -
Average 00:02.04 Drew Brads World Championship 2017 (13-16 July) 00:01.52 / 00:01.70 / 00:02.26 / 00:03.21 / 00:02.17
Rubik\'s Clock Single 00:03.73 Nathaniel Berg Danish Open 2015 (20–21 June) —
Average 00:05.22 Tairan Zhong (钟泰然) Quanzhou Side Event 2017 (19 August) 00:05.46 / 00:06.19 / 00:04.97 / 00:04.81 / 00:05.24
Average 00:02.55 Jonatan Kłosko Polish Open 2017 (15-17 September) 00:04.59 / 00:02.72 / 00:02.45 / 00:02.09 / 00:02.49
Square-1 Single 00:05.73 Charlie Stark Guildford Open 2017 (23-24 September) —
Average 00:08.45 Brandon Lin Rockville Winter 2017 (14 January) 00:08.35 / 00:07.84 / 00:09.76 / 00:07.31 / 00:09.16
Kaijun Lin (林恺俊)
5×5×5 Blindfolded Single 03:47.50 Kaijun Lin (林恺俊) Beijing Open 2017 (24–25 June) —
3×3×3 Multiple Blindfolded Single 41/41 Marcin Kowalczyk SLS Swierklany 2013 (16 November) 54:14
A scatter plot of Rubik's Cube world records(single and average) against time. This depicts the improvement made over the years, as well as highlight records that stayed unbroken for an unusual amount of time.
Members of the cubing community lubricate their cubes to allow them to be manipulated faster, easier, and more reliably than a non-lubricated cube. The WCA allows lubrication for official competitions.
Popular lubricants among speedcubers are:
* Cubicle Silicone Lube/Lubicle * Traxxas 30/50K Differential Oil * Maru Lubricant * Lubix Cube Lubricant * SpeedCubeShop Speed Lube * Cubesmith Lubricant * DNM-37 * LumaLube
Checking a lubricant's MSDS is often helpful in identifying cube-damaging ingredients.
Below are some definitions of words generally used by the speedcubing
community. For a more complete list of speedcubing terminology, see
the cubefreak.net glossary.
* ^ "WCA Regulations". World Cube Association. Retrieved 2 August
* ^ "22x22 rubik\'s cube World Record". YouTube. Retrieved 2 August
* ^ "World Records for 3x3 single and average". World Cube
Association. Retrieved 2 July 2017.
* ^ "Competitions". World Cube Association. Retrieved 2 August
* ^ "
David Singmaster Solution". Van Ness Web. Retrieved 2 August
* ^ "Guus Razoux Schultz". Speedsolving.com Wiki. Retrieved 2
* ^ "Speed Cubing". Rubik's Official Website. Retrieved 2 August
* ^ "Rubik\'s Cube: Algorithms for the last layer". Université