2-Gen
Stands for 2 Generator, an algorithm that uses only two sides or slices of the puzzle.
Sune; R U R' U R U2 R' U2 is a classic 2-gen algorithm that uses only R and U, the most common sides used in 2-gens for the 3x3x3 cube, but also M and U are common. These moves are the fastest for most cubers to preform, so though there might be several different ways to complete the same algorithm, the 2-Gen one, if there is one, is most often used, possibly over a shorter algorithm using awkward moves like B, f, S, etc.
For example,
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Alg | R'UR'U'R'U'R'URUR2 |
a 2-Gen, and
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Alg | y2F2UR'LF2RL'UF2 |
a 4-Gen, do the same thing (a three-edge cycle) but one is much faster.
The Roux and Petrus 3x3 methods have completely 2-Gen steps. In Roux, the final step is done by turning only the M slice and the U layer, with the exception of the E slice in a special case. In Petrus, the F2L is finished with only R and U turns.
There are other "Gen's" too, such as 3 and 4-Gen's There are also 2-Gens for left-handed people that use L and U instead of R and U.
External links
- Speedsolving.com What are 2-gen algorithms?
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