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Kevin Hays (born 12 May 1994) is an American Rubik's Cube speedcuber. Recognized as an expert at solving big cubes ( 5x5x5 , 6x6x6 and 7x7x7 ), he has won 6 world championship titles and set 21 world records across the three events.
The Rubik's Cube waned in popularity after 1983, as there were no official competitions held, [8] but with the advent of the Internet, online websites began to surface to discuss the cube. With these websites facilitating the renewed popularity of the cube, a new generation of speedcubers arose.
The Simple Solution to Rubik's Cube by James G. Nourse is a book that was published in 1981. The book explains how to solve the Rubik's Cube. The book became the best-selling book of 1981, selling 6,680,000 copies that year. It was the fastest-selling title in the 36-year history of Bantam Books.
The cube restricted to only the corners, not looking at the edges; The cube restricted to only 6 edges, not looking at the corners nor at the other edges. The cube restricted to the other 6 edges. Clearly the number of moves required to solve any of these subproblems is a lower bound for the number of moves needed to solve the entire cube.
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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]
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