[gus_massa]

From the blog post:

> Our method currently solves the Rubik’s Cube 20% of the time when applying a maximally difficult scramble that requires 26 face rotations. For simpler scrambles that require 15 rotations to undo, the success rate is 60%.

And looking at the data in http://cube20.org/qtm/ , with a random cube, the probability to have a maximal-scrambled cube that needs 26 quarter-turns is 10^-20, but most (~75%) of the random cubes need 20 or 21 quarter-turns. Most of the algorithms don't use the most efficient path to solve the cube, so if the best path has 20 steps, the actual path will have a hundred or more steps.

To solve the cube in 15 steps, it must start as almost solved. It's not what people usually call "normal conditions".