- With this variant the user builds the cross on the left face, as opposed to the down face in standard CFOP. This allows the F2L to be solved using primarily moves. Rotations on the x-axis (i.e., x-rotations) are generally faster than the y-rotations that would be used otherwise, however, when the F2L is finished, the solver must perform a z' to place the last layer on the top of the cube for OLL and PLL.- Instead of solving the last layer using OLL and then PLL, you solve the corners using CLL and then the edges using ELL. The reason that this isn’t used very often is because of slower recognition and algorithms that are harder to fingertrick. However, some very experienced CFOP users know ELL just in case the corners of the last layer are solved, so they can 1-look LL.CLL algs: http://www.speedsolving.com/wiki/index.php/CLL_algorithms_(3x3x3) ELL algs: http://www.speedsolving.com/wiki/index.php/ELL - Involves learning algorithms to orient edges while inserting the last F2L pair. This leaves you with a “top cross,” similar to what you get when you finish F2L with ZZ or Petrus. Involves learning 32 algorithms.Algs: http://www.cubewhiz.com/vh.php - Involves learning several algorithms for every last slot F2L case to force all edges to be oriented - this part totals 125 algorithms alone, not including mirrors and inverses.. Full ZB then involves learning an algorithm for every possible case on the top that could result - this is called ZBLL, and can be combined with ZZ or Petrus. ZBLL contains almost 500 cases. Very few people have ever learned ZB, and no one has successfully learned it and gotten relatively fast at it. “A fate worse than death.”ZBLS: http://jmbaum.110mb.com/zbf2l.htm ZBLL: http://jmbaum.110mb.com/zbll.htm : While inserting the final F2L pair, you solve the OLL, leaving you with just a PLL. The two steps are ELS and CLS. You insert the F2L edge while orienting the edges(ELS), then you insert the F2L corner while orienting the corners(CLS). This just leaves you with a PLL. This method, as far as we know, has never been put into practice. This method requires memorization of 69 algs, not including mirrors.MGLS: http://cube.garron.us/MGLS/