Keyhole First Two Layers
Keyhole First Two Layers or keyhole F2L is a method that solves, normally, the first two bottom layers of the 3x3x3 cube.
You start, like in normal LBL from a cross, then you fill in three of the first layer corners. From that point you solve three of the middle layer edges using the empty corner position as the keyhole. After three corners and edges are solved you compleate F2L by first solving the last corner and finaly the last edge is solved using the normal LBL algorithm: R U R' U' F' U' F or the mirror F' U' F U R U R' depending on the current orientation of the edge.
An alternative way to do keyhole F2L is to use this order:
- cross (doesn't have to match centers)
- 3 corners
- 4 edges
- 4th corner
For that you will need three algorithms to solve the last pice depending on it's orientation:
List of algs...
