One Question

[fourdown00]

what does an [X]/[X'] or [Y]/[Y'] mean?

 

[Theromy]

X = rotate cube clockwise on X axis (roll cube away from you one face)
X' = opposite

X makes the Front face the Up face, X' makes the Back face the Up face.

Y = Rotate cup clockwise on Y axis (roll cube to the left)
Y' = opposite

Y = Right face becomes Front face
Y' = Left face becomes Front face.

 

[badmephisto]

here is a notation list:
http://www.cubewhiz.com/notation.html

rotation moves like X or Y are at bottom of the page.

 

[annon]

x is like R, y like U, and z like F.

 

[Johannes91]

Cube rotations are usually typed in lower case: x,y,z. Uppercase X and Y are sometimes used to denote move sequences, for example X Y X' Y' is a commutator (where X could be R U R' and Y could be D, for example).