Turn the V to the back, then put the red-blue edge into the top back slot.
Goal
Add the third edge around the back corner. After this lesson the back corner and all four centers are solved.
How to hold it
Turn the whole puzzle (y) so the V is at the back. Yellow is on the bottom and green points at you. The empty slot is the top back edge, between the red and blue faces.
How to recognize it
Find the red-blue edge. It is on one of the three edges of the front face, with red or blue facing you. Add the case where it is in its slot but flipped: seven cases in all.
Steps
- Find the red-blue edge.
- See which edge of the front face it is on, and which color faces you.
- Do the algorithm for that case.
Memory tips
Four algorithms look like R U R' U': two turns, then those two turns undone. Two more put L R' L' R or R' L R L' between two U turns.
Check
All three edges around the back corner match: yellow-red, yellow-blue and red-blue. The four centers are still right.
Common mistakes
- Keeping the V on the left like the last lesson: turn it to the back.
- Misreading which color faces you, so you do the other case's algorithm.
What next
The last lesson solves the three edges of the front face.