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The scheme of shift 2 ribs

Sometimes in big cubes can have the situation where two edges not fell into place, in this case, you can exchange them for the next uncomplicated movement:

Rotate one part of middle layer on 180⁰ Rotate top side on 180⁰. Put the place for first Yellow pair. Put firs pair on its place. Rotate on 180⁰ Rotate top side on 180⁰. Put the place for second Yellow pair. Put second pair on its place. Rotate on 180⁰

 

The principle of the permutation centers in big cubes

All central elements in big cubes obey the principle of permutation centers on the cube 3x3x3, consider an example:

Blue to Red place Yellow to Blue place Return first line to place Return second line to place We moved 6 central elements or 3 axis

That is, were the same as in the 3x3x3 cube, only shifted coordinate axis.

Now we can do the next focus. Before returning axises to its place perform substitution:

Rotate Yellow side on 90⁰ and replace Red center on axis to Yellow center Return first axis to place Return second axis to place Blue center to place Return two layers to place

 

 

As a result of this substitution, we have found that 2 central elements exchanged their places, and on the other side of all the centers back to the places:

Applying only this scheme with a different offset coordinate axis, we can gradually put all the central elements. We can also move the central elements, moving several axises:

In the result:

Now making a substitution in the same way, we can to swap 2 central elements.

Another move for a quick exchange pairs parallel of the central elements:

Rotate on 180⁰ Rotate on 180⁰ Return first layer Return second layer 2 pairs of parallel central elements exchanged

Note we can move several central elements if rotate several layers.


Date: 2015-12-24; view: 843


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