Difference between revisions of "First Two Layers"
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Revision as of 19:51, 1 April 2011
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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. Normally it is as above but it may also refer to the part of the Fridrich method that solves the pairs without counting the cross part.
2-gen F2L, most pairs (30:42) 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 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 corner-edge 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.
The concept of pairing up four corner/edge pairs was first proposed by Ren Schoof in 1981.
F2L |
Easy Cases
F2L 1
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F2L 2
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F2L 3
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F2L 4
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Reposition Edge
F2L 5
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F2L 6
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F2L 7
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F2L 8
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Reposition Edge and Flip Corner
F2L 9
F2L 10
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F2L 11
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F2L 12
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F2L 13
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F2L 14
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Split Pair by Going Over
F2L 15
(FL open) |
F2L 16
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F2L 17
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F2L 18
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Pair Made on Side
F2L 19
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F2L 20
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F2L 21
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F2L 22
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Weird
Corner in Place, Edge in U Face
F2L 25
Back Right slot open - (R2 U' R' U R2) or (U D' R U' R' D) |
F2L 26
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F2L 27
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F2L 28
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F2L 29
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F2L 30
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Edge in Place, Corner in U face
F2L 31
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F2L 32
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F2L 33
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F2L 34
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F2L 35
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F2L 36
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Edge and Corner in Place
F2L 37Solved |
F2L 38
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F2L 39
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F2L 40
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F2L 41
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F2L 42
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See Also
External Resources
- RiDo's Hunting Story - Simple analogy method for F2L
- Opticubes.com Optimal F2L Cases
- Erik Akkersdijk's F2L Cases (from his old site)
- Dan Harris's F2L Cases
- Jason Baum's F2L Cases
- Andy Klise's Printable F2L PDF
- Erik Expert F2L tutorial
- CubeLoop F2L Algs
- Cubefreak Advanced F2L
- Multislotting Tutorial
- Youtube: How to get faster at the 3x3 Rubik's cube - F2L - by Feliks Zemdegs
- Youtube: Rubik's Cube: Fridrich F2L explained - by Badmephisto