Wednesday, September 30, 2015

Rubik's cube solved in 4.21 seconds!

This video is a good example for learning some techniques on solving the Rubik's cube  if you want to become a very fast solver because here Feliks revealed his method and solution. If you follow the scramble, the first thing you will notice is the connected pair. Feliks never fails to take advantage of this situation. He uses this pair to create an extended cross or a cross with one F2L pair already inserted. Normally, a beginner will use the color white as the color of his cross but surprisingly, in this case he used orange as his cross color. In this scramble, white can also produce an extended cross but he preferred orange because it saved him maybe a couple of turns. On the second layer, you will notice that he used common F2L algorithms that he learned intuitively. On the the third layer he used common OLL algorithm and PLL algorithm. Therefore, the entire solution based on this video is called CFOP method or Cross-F2L-Orientation-Permutation method.

These are the things that you will learn from this video:

  • You need to learn how to solve the bottom cross on all colors. Usually as a beginner, you are advised to be consistent on your cross color because it would be easier to familiarize yourself with F2L insertions. Feliks has proven that color neutrality is the best approach in solving the cross because it gives more opportunities of an easy cross solve like this example video.
  • You need to learn how to take advantage of connected pair(s) in order to make an extended cross thus reducing the unsolved F2L pairs into three (the first one is already inserted on .the extended cross). It would be better if you can learn how to make a double extended cross thus reducing the unsolved F2L pairs into two.
  • You need to learn how to look ahead of your F2l pairs during inspection in order to make a smooth transition from cross to F2L. Feliks wrote that he "saw" the first three pairs. Of course what he meant was he predicted the resulting positions of these three pairs. If you think it is possible to "see" four pairs during inspection then try it!
  • You need to learn muscle memorization of OLL and PLL. Of course Feliks was not thinking of these algorithms! As soon as he recognized the resulting OLL (even before finishing the last F2L pair), his hand muscle memory will execute these algorithms.
  • You need to execute continuous execution of cross to OLL as if the solutions involved  were just one algorithm. In this video, Feliks paused only for a fraction of a second before PLL execution maybe because the resulting G perm was not easy to recognize. Well, if you can solve the cube from start to finish without any pause then try it! You need to learn to increase your tps or turn per second to more than 12 tps! In this video, Feliks has reached 12.35 tps. Maybe this could only be possible if you can execute every algorithm of F2L, OLL, and PLL in just one second or less. You also need to execute the cross or x-cross in just a second and the resulting F2L pairs in less than 2 seconds (assuming these are practically possible). 
These are the things that I observed on this video but Feliks has also other techniques like OLL and PLL skip including orientation of the top cross during F2L and other techniques that he did not used on this particular solve.

Here is the full video:





This could be one of the best comments on this video:


+BlokeOzzie You need to distinguish between "prepared solve" and normal solve. Yes he scrambled it himself, but it's legit because he has never tried that exact scramble before. If he tried the same scramble more than 1 time, it's called prepared solve and not legit..  Of course he could fake and lie about it, but he holds several world records and is by most people considered to be the best cuber ever. Also cubers of his caliber have too much honor and would never fake/cheat... This is real.