Lesson 6
Learn and practise the algorithm that makes the yellow cross on the top face.
Goal: a yellow cross on the top face. All four top edges have yellow facing up; the corners do not matter in this stage.
Look at the yellow stickers of the four top edges, not the corners. There are three cases: a dot if none has yellow facing up, an L shape if two neighbouring edges do, a line if two opposite edges do.
No top edge has yellow facing up. Do the yellow cross algorithm (F R U R' U' F'); an L shape appears.
Two neighbouring edges have yellow facing up. Turn the top layer so these two edges are at the back and on the left. Do the yellow cross algorithm (F R U R' U' F'); a yellow line appears.
Two opposite edges have yellow facing up. Turn the top layer so the line runs from left to right. Do the yellow cross algorithm (F R U R' U' F'); the yellow cross is complete.
You always do the same yellow cross algorithm (F R U R' U' F'); what changes is how you turn the top layer first. A dot becomes an L shape, an L shape becomes a line, and a line becomes the cross.
Yellow cross
F R U R' U' F'
When: When the top has no yellow cross. Hold a line horizontal, an L shape at the back and left, a dot at any angle. Repeat until the cross is there.
Finger tip: It has three parts: F, the right-hand move (R U R' U'), F'. You already know the right-hand move.