Difference between revisions of "First Two Layers"
Line 32:  Line 32:  
=== Fridrich F2L ===  === Fridrich F2L ===  
−  There are many ways to solve the 'F2L' on a cube. A common system is using the [[Fridrich]] method first two layer approach. After solving the cross, a corneredge pair is paired up, and then inserted into the correct slot. A total of four corner edge (or 'CE') pairs are made and inserted to solve the first two layers.  +  
+  There are many ways to solve the 'F2L' on a cube. A common system is using the [[Fridrich]] method first two layer approach. After solving the cross, a corneredge pair is paired up ('''form pair'''), and then inserted into the correct slot ('''pair insertion'''). A total of four corner edge (or 'CE') pairs are made and inserted to solve the first two layers.  
The concept of pairing up four corner/edge pairs was first proposed by [[René Schoof]] in 1981.  The concept of pairing up four corner/edge pairs was first proposed by [[René Schoof]] in 1981.  
+  
+  
+    
+  
{{F2L}}  {{F2L}} 
Revision as of 17:53, 1 March 2018


First Two Layers, or F2L are normally the first two bottom layers of the 3x3x3 cube, or essentially all layers up until the last layer on larger cubes.
The definition is a little different depending on the subject or who you are talking to. Usually, it refers to the part of the CFOP and CFCE methods that solve the first two layers in pairs, excluding the cross step.
2gen F2L, most pairs (30 of 41) have the edge sitting in the Ulayer having two orientations, it shows R or F colour at the side. If it is the R colour you can solve the pair using only RU and if it is the F colour you can turn the cube (y') and sovle the pair to the back slot using only RU. The only pairs that needs both R and F turns are the six ones with the edge unoriented in the slot, if the edge is oriented in the slot both ways works.
Approaches
Petrus F2L
Another way to solve the 'F2L' is by building blocks, common during the first two layers of the Petrus method.
Fridrich F2L
There are many ways to solve the 'F2L' on a cube. A common system is using the Fridrich method first two layer approach. After solving the cross, a corneredge pair is paired up (form pair), and then inserted into the correct slot (pair insertion). A total of four corner edge (or 'CE') pairs are made and inserted to solve the first two layers.
The concept of pairing up four corner/edge pairs was first proposed by René Schoof in 1981.
F2L 
Easy Cases
F2L 1

F2L 2
 
F2L 3

F2L 4

Reposition Edge
F2L 5

F2L 6
 
F2L 7

F2L 8

Reposition Edge and Flip Corner
Split Pair by Going Over
F2L 15
Front left slot open: U (R U' R') D (R U' R') D' Back right slot open: U' (R' U R U') (R U R') F2L 16
 
F2L 17

F2L 18

Pair Made on Side
F2L 19

F2L 20
 
F2L 21

F2L 22

Weird
F2L 23

F2L 24

Corner in Place, Edge in U Face
F2L 25
If the back right slot is open:

F2L 26
 
F2L 27

F2L 28
 
F2L 29

F2L 30

Edge in Place, Corner in U face
F2L 31

F2L 32
 
F2L 33

F2L 34
Back right slot open:
 
F2L 35

F2L 36

Edge and Corner in Place
F2L 37Solved 
F2L 38
 
F2L 39
F2L 40
 
F2L 41

F2L 42

See also
External Resources
Beginner
 RiDo's Hunting Story Uses a simple analogy method for F2L, but not comprehensive
 Beginner's F2L: 3 steps for every case Excellent F2L guide covering every scenario
Standard
 Erik Akkersdijk's F2L Cases (from his old site)
 Dan Harris's F2L Cases
 Opticubes.com Optimal F2L Cases
 Jason Baum's F2L Cases
 Andy Klise's Printable F2L PDF
 CubeLoop F2L Algs
 Bob Burton's F2L Cases
 F2L algs for every case from all angles by Shotaro Makisumi
 Youtube: How to get faster at the 3x3 Rubik's cube  F2L  by Feliks Zemdegs
 Youtube: Rubik's Cube: Fridrich F2L explained  by Badmephisto
Advanced
 Youtube: Viktor Danilov Expert F2L (Russian language)
 Database: Website for Viktor Danilov F2L series
 Erik Expert F2L tutorial
 Cubefreak Advanced F2L
 Multislotting Tutorial
F2L Trainers