Understanding Rubik's Cube Notation: A Complete Guide
Published by System Administrator
What Is Cube Notation?
Rubik's Cube notation is a universal language that allows cubers worldwide to communicate move sequences precisely. Developed in the 1980s by David Singmaster, this system assigns a single letter to each of the six faces of the cube, then uses modifiers to indicate the direction and extent of rotation. Whether you're reading a tutorial from Japan, watching a solve from Brazil, or studying algorithms from a database, the notation remains the same.
Understanding notation is the very first skill you need before learning any solving method. Without it, you cannot read algorithms, follow tutorials, or communicate your solutions to other cubers. The good news is that the system is logical, consistent, and can be memorized in under ten minutes.
The Six Face Letters
Each face of the cube is represented by a single uppercase letter based on its position relative to the solver:
- R (Right): The face on your right side
- L (Left): The face on your left side
- U (Up): The top face
- D (Down): The bottom face
- F (Front): The face facing you
- B (Back): The face facing away from you
A single letter by itself means a 90-degree clockwise rotation of that face when looking at it directly. So "R" means turn the right face 90 degrees clockwise (as if you were facing the right side).
Modifiers: Prime and Double
Two modifiers extend the basic notation:
- Prime (') notation: An apostrophe after the letter (e.g., R', U', F') means a 90-degree counter-clockwise rotation. This is sometimes called an "inverse" move. In spoken cubing, R' is pronounced "R prime" or "R inverse."
- Double (2) notation: A number 2 after the letter (e.g., R2, U2, F2) means a 180-degree rotation. The direction doesn't matter for double turns since clockwise and counter-clockwise 180° result in the same state.
Wide Moves, Slice Moves, and Rotations
Beyond single-face turns, advanced notation includes three additional categories:
Wide moves (lowercase or 'w' suffix) turn two layers together. For example, "Rw" or "r" turns both the R face and the adjacent middle slice simultaneously. These are essential for methods like Roux and certain F2L techniques.
Slice moves turn only the middle layer between two opposite faces:
- M (Middle): The slice between L and R, turned in the same direction as L
- E (Equator): The slice between U and D, turned in the same direction as D
- S (Standing): The slice between F and B, turned in the same direction as F
Rotations reorient the entire cube without moving any pieces relative to each other:
- x: Rotate the entire cube on the R axis (as if doing an R move with the whole cube)
- y: Rotate the entire cube on the U axis
- z: Rotate the entire cube on the F axis
Reading Algorithm Strings
Algorithms are written as sequences of moves separated by spaces. For example, the T-perm algorithm is: R U R' U' R' F R2 U' R' U' R U R' F'. When reading this, execute each move from left to right in order. Spaces are just for readability — they have no timing significance. Practice reading algorithms slowly at first, executing one move at a time, then gradually speed up as the sequence becomes muscle memory.
Some resources group moves with parentheses to show triggers or recurring patterns, like (R U R' U') which is the famous "sexy move" trigger that appears in many algorithms. These groupings are just visual aids and don't change how the moves are executed.