Some methods of solving
There are different methods of solving the Rubik's Cube aside from the Beginner's Method. One of these is the CFOP(Cross - F2L - OLL - PLL) Method,which is also known as Fridrich Method. The first step in solving is to form a cross on the first layer. Next is to solve the First 2 Layer (F2L), in which you fill in the four slots between the cross pieces, one slot at a time. Each slot is filled by inserting a corner and its corresponding edge simultaneously. The completion of this step leaves one with just the last layer, typically placed on top. 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). There are 57 nontrivial cases. Click here to see all. 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). There are 21 nontrivial cases. Click here to see all.
Another is the ZZ method, which is a 3x3 speedsolving method created by Zbigniew Zborowski in 2006. The method is focused both on low move count and high turning speed; during the majority of F2L, the solver only needs to make L, U, and R moves, which means that the solver's hands never leave the left and right sides of the cube, resulting in faster solving. In addition, edges are already oriented when the solver reaches the last layer, meaning the solver has fewer cases to deal with. The initial pre-planned step is called EOLine. This is the most distinctive part of the ZZ method. It involves orienting all edges while placing two opposite down-face edges aligned with their corresponding centers. 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.
The Roux Method is a 3x3 speedsolving method invented by French speedcuber Gilles Roux. Unlike the Fridrich and Petrus methods, the inventor of this method has used it to achieve an official sub-15 average.The first step of the Roux method is to form a 3×2×1 block placed in the lower portion of the left layer. The second step is to create another 3×2×1 on the opposite side. The remaining four corners are then solved using a set of algorithms known as CMLL (Corners of the Last Layer), which leaves six edges and four centers that are solved in the last step. 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 more easily 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.
Competitions
According to the World Cube Association (WCA), competitors (in the same round) must solve cubes that are scrambled using a consistent set of moves (every competitor solves the same scramble). During the first world championship, competitors were not allowed to use their own cubes and were required to use those that were issued by the competition. These cubes were very low quality by speedcubers' standards, but since the revival in the 2000's this no longer applies and competitors can use whichever cubes they choose that comply with WCA regulations. Currently, the official timer used in competitions is the StackMat timer. This device has touch-sensitive pads that are triggered by the user lifting 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. In addition to the electronic timer, there are human judges with stopwatches who time the 15-second inspection period before each solve, as well as solves which may take longer than 10 minutes. These judges also ensure that the competitors are following competition regulations.Source:
- https://en.wikipedia.org/wiki/Speedcubing
- https://www.speedsolving.com/wiki/index.php/Roux
- https://www.speedsolving.com/wiki/index.php/ZZ
- https://www.speedsolving.com/wiki/index.php/CFOP
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