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The maximal number of face turns needed to solve any instance of the Rubik's Cube is 20, [2] and the maximal number of quarter turns is 26. [3] These numbers are also the diameters of the corresponding Cayley graphs of the Rubik's Cube group. In STM (slice turn metric), the minimal number of turns is unknown.
Vincent Sheu has been an active speedcuber since 2006. [8] He typically uses the CFOP method, a layer-by-layer system popularized by Jessica Fridrich in 1997. [9] In 2011, Sheu tied the existing world record for a 2x2x2 single solve with a time of 0.96 seconds at the Berkeley Winter Cube Competition. [10]
Solving a Rubik's cube in 10.48 seconds Tobias "Toby" Mao (born December 21, 1988) is a former world-class Rubik's Cube solver. Hailing from Hillsborough, California , Toby graduated from Crystal Springs Uplands School in 2007 and went on to study mathematics at Northwestern University in Evanston, Illinois .
A scrambled Rubik's Cube. An algorithm to determine the minimum number of moves to solve Rubik's Cube was published in 1997 by Richard Korf. [10] While it had been known since 1995 that 20 was a lower bound on the number of moves for the solution in the worst case, Tom Rokicki proved in 2010 that no configuration requires more than 20 moves. [11]
The early cubes often broke and Hammond started corresponding with David Singmaster who was importing and selling Rubik's Cubes. Singmaster reported Hammond's speed in solving the Rubik's Cube (28 seconds) in his Rubik's Notes and later in his Cubic Circular. [2] By 1980, Hammond had the fastest times for solving the Rubik's Cube.
Leyan Andrew Lo (born November 24, 1985) is an American Rubik's Cube speedcuber. He held the world record of 11.13 seconds for the fastest Rubik's Cube solve until Toby Mao in 2006 had a solve of 10.48 at the U.S. nationals competition in San Francisco. Leyan appeared on The Tonight Show with Jay Leno, where he solved a Rubik's Cube in 18.9 ...
Non-human solving: The fastest non-human Rubik's Cube solve was performed by Rubik's Contraption, a robot made by Ben Katz and Jared Di Carlo. A YouTube video shows a 0.38-second solving time using a Nucleo with the min2phase algorithm. [98] Highest order physical n×n×n cube solving: Jeremy Smith solved a 21x21x21 in 95 minutes and 55.52 seconds.
On a crazy cube type I, they are internally connected in such a way that they essentially move as 8 distinct pieces, not 24. To solve such a cube, think of it as a 2x2x2 (pocket cube) trapped inside a 4x4x4 (Rubik's Revenge). Solve the 2x2x2 first, then solve the 4x4x4 by making exchanges only. Solving the type II is much more difficult.