Move Notation
To denote a sequence of moves on the 3×3×3 Rubik's Cube, this article uses "Singmaster notation"., which was developed by David Singmaster.
The letters L,R,F,B,U,D indicate a quarter clock-wise turn of the left, right, front, back, up and down face respectively. Half turns are indicated by appending a 2. A quarter counter clock-wise turn is indicated by appending a prime symbol ( ′ ).
Read more about this topic: Optimal Solutions For Rubik's Cube
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“To play is nothing but the imitative substitution of a pleasurable, superfluous and voluntary action for a serious, necessary, imperative and difficult one. At the cradle of play as well as of artistic activity there stood leisure, tedium entailed by increased spiritual mobility, a horror vacui, the need of letting forms no longer imprisoned move freely, of filling empty time with sequences of notes, empty space with sequences of form.”
—Max J. Friedländer (1867–1958)