r/Cubers•10 yr. ago

Daily F2L Discussion - Case 5 + hiding pieces

Resource

Setup: R U R' U2 R U' R' U

Most important solution: U' R U R' U2 R U' R'

Angles: Easy from FR + BL. Harder from FL + BR.

Mirror: Case 6

Discussion of F2L angles:

This is the first non-trivial case. It can be handled easily from the FR and BL via fairly intuitive algorithms. From the FL or BR, it's best to do a single cube rotation (either y or y') and use a FR/BL algorithm. This can be generalized to an extraordinarily important point:

Most cases are easy from either the FR/BL or the FL/BR. If you can't figure out a way to solve an F2L case easily from one angle, do a y or y'. However, you should NEVER do a y2. If you can solve a case easily upon the application of a y2, then you could have solved it easily without doing the rotation at all!

Discussion of piece hiding:

Inspection of case 5 reveals that, if the edge is simply moved 90 degrees clockwise, then we'll get [case 1] (https://www.reddit.com/r/Cubers/comments/41gxqa/daily_f2l_1/). However, simply doing a U would move both the edge and the corner. In order to move the edge without moving the corner, we need to hide the corner, move the edge, and unhide the corner.

Hiding a corner simply means to temporarily remove it from the top layer and place it into the bottom layer. Doing this will allow you to reposition any edge in the top layer. A corner in a given position can be hidden in two ways. In this example, the yellow blue red corner can be hidden using R' or F. The yellow green red corner can be hidden using R or B', etc. There are few things to keep in mind when hiding pieces:

Hiding a piece breaks up the cross. You must unhide the piece and fix the cross at some point in the solution process.
Hiding a piece brings up the contents of an F2L slot into the top layer. It is absolutely essential that you bring up an empty F2L slot when hiding your pieces. Destroying already formed F2L slots is counterproductive.
When figuring out how to hide a piece, try to use R/R' or L/L' rather than F, F', B, or B', as they are easier to execute. You may need to do a single cube rotation.

Discussion of Case 5:

Finally, this case can easily be solved by hiding the corner (U' R), moving the edge 90 degrees clockwise (U), and unhiding the corner (R'). You now have [case 1] (https://www.reddit.com/r/Cubers/comments/41gxqa/daily_f2l_1/), which can be solved in a multitude of ways.

The case is easy from FR/BL. For the other two angles, it's best to do a cube rotation, although less-intuitive algorithms utilizing l/r moves also exist.

Algorithms

[Front Right (FR)](http://cube.crider.co.uk/visualcube.php?fmt=png&size=200&stage=f2l&case=U' R U R' U2 R U' R'.png)

U' R U R' + {case 1}