# First Two Layers

(Redirected from F2L)

 F2L Information Proposer(s): John Conway, David Benson, and David Seal Proposed: 1979 Alt Names: First Two Layers Variants: ZZ F2L, ZBLS, VHF2L, WV, MGLS, possibly others Subgroup: No. Algs: 0 to 41; hundreds more with Advanced F2L Avg Moves: 6.7 HTM per slot; ~26.8 HTM per four slots Purpose(s): Speedsolving, FMC

First Two Layers, or F2L refers to 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. Or it can refer to ZZ's F2L.

2-gen F2L, most pairs (30 of 41) have the edge sitting in the U-layer 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 solve the pair to the back slot using only R and U moves. 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 corner-edge 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. This step of the cube should be done intuitively, even though there are algorithms for each case, algorithms should only be used for slower cases.

The concept of pairing up four corner/edge pairs was first proposed in 1979 by John Conway, David Benson, and David Seal in two separate publications.[1] The idea appeared in other publications starting in 1981.

### ZZ F2L

ZZ F2L is very similar to CFOP F2L, but there are some differences in ways you can pair up pieces. ZZ is more blockbuilding centered, and in result, F2L can be completed using block building.

## Basic Inserts

### F2L 1

 F2L U (R U' R') [2]
 F2L R' F R F' [3]
 F2L U2 (R U2 R')
 F2L y' U f R' f'
 F2L y' r' U' R U M'

### F2L 2

 F2L y' U' (R' U R)
 F2L U' (F' U F)
 F2L F R' F' R [4]
 F2L y U' (L' U L)
 F2L d' L' U L
 F2L r U R' U' M
 F2L F l' U' l
 F2L y U' (f' L f)

### F2L 3

 F2L F' U' F [5]
 F2L y2 f' L' f
 F2L y' (R' U' R)
 F2L y (L' U' L)

### F2L 4

 F2L (R U R') [6]
 F2L y F U' F'
 F2L y' f R f'

## Reposition Edge

### F2L 5

 F2L (U' R U R') U2 (R U' R') [7]
 F2L F2 (L' U' L U) F2

If the front left slot is open:

 F2L U F' R' F' R F

If the back right slot is open:

 F2L U R F R' F' R'

### F2L 6

 F2L U' (r U' R' U) (R U r') [8]
 F2L R2 (B U B' U') R2
 F2L y F2 (R U R' U') F2

If the front left slot is open:

 F2L U' F' R' F R F

If the back right slot is open:

 F2L U' R F R F' R'

### F2L 7

 F2L (U' R U2 R')2
 F2L M' U' M U2 r U' r'
 F2L R U B U2 B' U R'

### F2L 8

 F2L (U F' U2 F)2
 F2L (r' U2) (R2 U R2 U r) [10]

## Reposition Edge and Flip Corner

### F2L 9

 F2L U' R U' R' d R' U' R
 F2L U' R U' R' U (F' U' F) [11]
 F2L y F2 (U R U' R') F2

If the back right slot is open:

 F2L R' U' R F' U' F

If the front left slot is open:

 F2L F U' F2' U' F

### F2L 10

 F2L U' (R U R' U)(R U R') [12]
 F2L R d' R U R' U2 F'
 F2L U F' U F U' R U R'
 F2L d R' U R d' R U R'
 F2L y2 B2 (U' R' U R) B2

If the front left slot is open:

 F2L F U F' R U R'

If the back right slot is open:

 F2L R' U R2 U R'

### F2L 12

 F2L R' U2 R2 U R2 U R [15]

If the back right slot is open:

 F2L R' U2 R2 U R'

### F2L 13

If the back right slot is open:

 F2L R' U R F' U' F

### F2L 14

 F2L U' (R U' R' U) (R U R') [17]
 F2L d' F U' F' d R U R'

## Split Pair by Going Over

### F2L 15

 F2L M U L F' L' U' M'
 F2L R B L U' L' B' R'
 F2L (F' U F) U2 (R U R')
 F2L F' U L' U L U2 F
 F2L R U2 B U B' U R'

If the back right slot is open:

If the front left slot is open:

 F2L R F U F' U' R'

### F2L 16

 F2L (R U' R') U2 (F' U' F) [19]

If the back right slot is open:

 F2L F' R' U' R U F

### F2L 17

 F2L (R U2 R') U' (R U R') [20]

### F2L 18

 F2L y' (R' U2 R) U (R' U' R) [21]
 F2L F' U2 F U F' U' F

### F2L 19

 F2L U R U2 R2 (F R F')
 F2L U (R U2 R') U (R U' R') [23]
 F2L (R U' R' U)2 R U R'

### F2L 20

 F2L d' L' U2 L U' L' U L

### F2L 21

 F2L (R U' R') U2 (R U R') [25]
 F2L U2 (R U R' U)(R U' R') [26]
 F2L R B U2 B' R'
 F2L U2 R x' U' R U x R2'

### F2L 22

 F2L F' L' U2 L F
 F2L r U' r' U2 r U r' [27]

## Weird

### F2L 23

 F2L U (F R' F' R) U (R U R') [28]

### F2L 24

 F2L U F' L' U L F R U R'

## Corner in Place, Edge in U Face

### F2L 25

 F2L U' (R' F R F') (R U R') [31]
 F2L R' F' R U R U' R' F
 F2L (U') F' R U R' U' R' F R [32]

If the back right slot is open:

 F2L R2 U' R' U R2
 F2L U D' R U' R' D

### F2L 26

 F2L U (R U' R') (F R' F' R) [33]
 F2L U R U' M' U R' U' M

### F2L 27

 F2L (R U' R' U)(R U' R') [34]
 F2L (R U' R2)(F R F') [35]
 F2L F' U' F U2 (R U' R')

### F2L 28

 F2L (R U R') d (R' U2 R)
 F2L y (L' U L U') (L' U L) [36]
 F2L (R U R') U (F' U2 F)
 F2L R U2 l U' R' U l'
 F2L (F' U F2)(R' F' R)

### F2L 29

 F2L (R' F R F')2
 F2L (R' F R F') (U R U' R') [37]

### F2L 30

 F2L (R U R' U')(R U R') [38]
 F2L U2 (F' U F)(R U R')

## Edge in Place, Corner in U face

### F2L 31

 F2L (R U' R') d (R' U R)
 F2L (R U' R' U)(F' U F)
 F2L U' (R' F R F') (R U' R') [39]
 F2L R U' l U' R' U l'
 F2L F2 r U r' F R U' R'
 F2L R U2 R' U' F R' F' R
 F2L R U' R B' R' B R'

### F2L 32

 F2L (U R U' R')3 [40]
 F2L (R' F R F')3
 F2L U2 R d' R U R' d R'
 F2L U R d' R U2 R' d R'
 F2L R2 U R2 U R2 U2 R2

### F2L 33

 F2L y U' L' U2 f' L2 f L
 F2L d' L' U2 f' L2 f L

If the back right slot is open:

 F2L u R U' R' u'

If the front left slot is open:

 F2L E F' U' F u

### F2L 34

 F2L U' (R U2' R') U (R U R') [42]
 F2L U (R U R') U2 (R U R') [43]
 F2L U y F U2 R U2 R' F'
 F2L U R U2 f R2 f' R'

If the back right slot is open:

 F2L E' R U R' E

If the front left slot is open:

 F2L u' F' U F u

### F2L 35

 F2L U' R U R' U (F' U' F) [44]
 F2L U' l U' R U l' U R'

### F2L 36

 F2L U F' U' F U' (R U R') [45]

## Edge and Corner in Place

Solved

### F2L 38

If the back right slot is open:

### F2L 41

If the back right slot is open:

### F2L 42

If the front left slot is open: