Edge Movements Part II

The two final U/D edges

You have fixed three of the four edges on the U and D faces. What now?

This part is trivial to do, but complicated to describe. You need to do slightly different things depending on the situation.

Turn U and D so that the two not-yet-fixed edges faces you, at FU and FD. There are several possibilities.

You may find both of them accidentally located at their correct position. If that is the case, congratulations! You can directly proceed to Part III.

Otherwise, more work is necessary.

Preparations

In all other cases, you want to fix FU and FD. Remember that, as a side effect, EM1BR and EM1BL moves UF to FD. We'll use this to fix both edges at the same time.

Look at EM1BR (Simplified) again.

Our plan is to have the necessary pieces at the two 'X' locations. Then EM1BR will fix them in one go.

To do so, we first move the white 'X' to the location FU. Using the color in the demonstration cube, it should be a red-white piece, whose final resting place is FD.

Since you do not mind disturbing FD, it is trivial to use some combinatinon of F and E to fix. Unfortunately, the only way to describe the process is to tediously list out all its possible current locations:

• If it is at FU (even if it is flipped incorrectly), you don't need to do anything. We'll flip edges after all of them have arrived at the correct location.
• If it is at BR, use EM1BR or EM1BL to move it to FU Both algorithms do the job, but the piece arrives in two different flip states. By choose the algorithm suitable for your current situation, you will result in one less flipped edge in the next section.
  EM1BRs: BR->UF

  EM1BLs: BR->FU
• If it is at BL, it is the same as when is at BR. You either do a left/right mirror image of the above, or start with an E^-1 move to convert the situation to the BR case.
• Similarly, if it is at FR or FL, start with an E or E² move to convert it to the BR case.
  EM1BRs: FL->UF

  EM1BRs: FR->FU
• There is only one remaining possibility. That the FD piece is already located at FD. In this situation, we know that FU is not located at FU, or else both pieces would have already been at their correct position and we would have proceeded to Part III. There are two ways to handle this, according to your preference.
  • (1) You can turn the cube over and forget about the (now) FU which is correctly located at FU. Just locate where FD is. It has to be in the E slice (since it is neither at FU nor FD). Process it using one of the sequences above.
    FD at FD: ignore it
  • (2) Or you can move the already correct FD to FU, which is what we have been trying to achieve.
    FD at FD: handle it

Now we have the FD piece located at FU. We are ready to fix FU and FD in one go.

Two pieces in One move

In the previous section, we have placed the FD at FU. We have also ensured that the FU piece is located in the E slice.

Use Eⁿ to move the FU piece to RB. Now you can fix both pieces with an EM1BR. This also brings the FD piece that you have prepared at FU to its final position.

Continue to Moving Edges Part III

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