Step 3/12 · Reduction

Last two centers: one or two pieces

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Twelve cases where the front's right column has only one or two pieces wrong, including the source's two core algorithms.

Goal

Solve the last two centers (green and red) once the other four are done. This lesson covers the cases where the front's right column has only one or two pieces wrong.

How to hold the cube

Green on top, red at the front. First, finish the two left columns of the front by lifting bars as in The first four centers. Every wrong piece then sits in the front's right column and on top.

How to recognize it

Look at the front's right column: one or two pieces are wrong, at the top, middle or bottom. Then find the red pieces on top. Top spots are named by back, middle or front row and left, middle or right column.

Memory tips

  • Every main algorithm is made of r U r', r U' r' or r U2 r' groups joined by a U turn.
  • In each group, r lifts the front's right column. The U inside the group picks which top column r' brings down.

Common mistakes

  • Holding the last two centers on the top and bottom. They must be neighbors, on top and at the front.
  • Turning R instead of r. The R turn does not touch the centers.

Next lesson

All six centers are done. Go to Pair the first 10 edges.

Step 1 / 7

r: Right inner layer: turn 90°, front face goes up (Written as TR in the textbook)

The top has red pieces in its front-right spot. The front has green pieces in its top-right spot.

Green on top, red at the front. The algorithm has 2 r ... r' groups.

Step 1 of 7: r. Right inner layer: turn 90°, front face goes up