Recently I am writing a program to solve 20x20x20 cubes. Since I am not good at solving cubes myself, I posted messages on this forum and many good guys replied and helped. One of this good guys give me two formula:
(1) For center: xR U' yR U xR' U' yR' U
(2) For edge/corner: r U2 r U2 F2 r F2 l' U2 l U2 r2
The first formual is very very powerful. With this single formula(with all kinds of iterations of course), the program now can solve all the central area of a randomly-messed-up 20x20x20 cube. Now, it is time to solve the edges and corners. But I do not quite understand the second formula. Could anyone explain a little more about it?
Generally speaking, I need a sequence of basic operations to change the edge/corner piece. The central area which is already ok should remain ok. And this sequence of operations should make as little change as possible(for example, ex-change two pieces?).
Thanks again! Any help will be appreciated!
(1) For center: xR U' yR U xR' U' yR' U
(2) For edge/corner: r U2 r U2 F2 r F2 l' U2 l U2 r2
The first formual is very very powerful. With this single formula(with all kinds of iterations of course), the program now can solve all the central area of a randomly-messed-up 20x20x20 cube. Now, it is time to solve the edges and corners. But I do not quite understand the second formula. Could anyone explain a little more about it?
Generally speaking, I need a sequence of basic operations to change the edge/corner piece. The central area which is already ok should remain ok. And this sequence of operations should make as little change as possible(for example, ex-change two pieces?).
Thanks again! Any help will be appreciated!
