Monday, March 16, 2009

Rubik's Cube

I like puzzles... and i happen to own several Rubik's cubes [at right: 2x2x2, 3x3x3 and the demoniac 4x4x4 (5x5x5 is hard to find...)]

Today i took the day to think a bit of solving approaches to the 3x3x3, the method i first learn was the layer by layer method, the first 2 layers and the top cross are pretty intuitive for me, i found the algorithms to solve them by myself, the top corners are easy but since i have a bad memory i can't memorize all the algorithms (like +50) that allow the a nice optimization.  So i researched for a new method, i found Lars Petrus method to be quite funny to apply, it requires some understanding of the cube, at least to solve the 2x3x3 (first 2 layers) but if applied the top cross will automatically be done and it isn't required to go into that 4 corners twist algorithms application.

I can't tell if the method is faster or not since i can do the cube under 90s (if i don't get too unlucky) with my old approach, this one requires a bit more of look ahead, but is funny how the top cross is automatically created (this is due to a parity trick in algorithm).


Now a question for the readers, you don't need to be a cube expert: Do you think it is easier to solve a 4x4x4 cube with different colors on the sides or with different images?

My answer is with different colors, at least with my method. I don't own a cube with images, but by trying to make patterns on the 4x4x4 i found out that it is really hard to make stuff on the place we want, so in a image all cubies have a specific place giving the same trouble.

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