(Don't look at the items marked with an asterisk)
1. What is the frontier?
When making f2l, put [a side block and a corner block] into the first floor and the second floor at the same time.
2. What is edge extraction?
Pull out the completed [a side block and a corner block] and put it on the third floor.
3. the idea of 3.oll: pick edge-> adjust (without affecting edge)-> insert edge.
4. What we need to do is:
Find a convenient formula for extracting, adjusting and inserting edges.
5. According to the experience of f2l, there are four corresponding situations for inserting the edge * * * (so extracting the edge).
Take the edge change in this case as an example today.
(Name this situation "Case A" first, which may come in handy later)
*6. four kinds of edges -> N kinds of adjustment methods-> corresponding to four kinds of inserted edges
So it should be possible to summarize most of the oll in this way.
→←↑↓
7. Formula of chamfering: (r ur ')(↓↓) (very convenient)
Interpolation formula: (R U' R) (↑→↓) (very convenient)
8. Adjust the formula (only introduce one): (r u r' u ')(↓↓→) (quite easy)
9. therefore, it is by "chamfering" > adjustment-> insert edge ":
(R U R')(R U R' U')n(R U' R)
(↑↓↓)(↑↓↓→)n(↓↓→)
10. Careful people will find that (R' R)(↓↑) between "trimming" and "adjusting" is redundant.
So the formula is simplified as (r u)->; (U R ' U ')(R U R ' U ')(n- 1)-& gt； (R U' R ')
(↑↓)-& gt； (↓↓→)(↑↓↓→)(n- 1)-& gt； (↑→↓)
If you don't understand at once, please take some time to understand. In case you don't understand, please make the formula according to Article 9.
1 1. If you can see this, congratulations, you have mastered the essence of oll, and you can sum up the formula yourself.
The following is the table of the influence of adjustment times on the top shape in case A, which I summarized.
Don't insert into the building
Author: momythom 2009-8-913:12 reply to this statement.
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3 Reply: Teaching post: How does oll understand oll? How to make OL simple? I'll fix it for you on the other side.
Note: "→↓↓↓↓" is garbled in Article 7 upstairs, please ignore it.
Table on the influence of adjustment times on the top table (please see the text version on the fourth floor for mobile phone parties)
Formula: (r u r') (r u r u') n (r u r) (note: this is a non-simplified version)
N= influence
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N=0 has no effect.
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N= 1 Simplified formula: (R u' 2 R u' 2 R u') (R u' r')
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N=2 Simplified formula: (r u' 2 r' u') (r u' u') (r u' r')
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N=3 Simplified formula: (R U' 2 R U') (R U' u') 2 (R U R')
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The formula of n=4 is useless ... it is too long.
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The formula of n=5 is useless ... too long.
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N=6 has no effect.
Author: mOmythOm2009-8-9 13:29 reply to this speech
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4 Reply: Teaching post: How does oll understand oll? How to make OL simple? I'll fix it for you on the other side.
Mobile Party Text Edition "Table of Influence of Adjustment Times on Top Table"
Formula: (r u r') (r u r u') n (r u r) (note: this is a non-simplified version)
When n=0, it has no effect on the top layer;
When n= 1, it can be simplified, and the simplified formula is: (r u' 2 r u' 2 r u') (r u' r').
When n=2, it can be simplified, and the simplified formula is: (r u' 2 r' u') (r u' u') (r u' r').
When n=3, it can be simplified, and the simplified formula is (R U' 2 r u' 2 r' u') (r u' u') 2 (r u' r').
N=4, 5 is useless because the formula is too long.
When n=6, it has no effect on the top layer.
Author: mOmythOm2009-8-9 13:33 reply to this speech
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5 Reply: Teaching post: How does oll understand oll? How to make OL simple? I'll fix it for you on the other side.
(This is a cycle of 6)
12. Why are there only three formulas? Are you a little disappointed? I gave you fishing skills, not fish.
The formula of adjustment is ever-changing, and you can find a convenient formula.
* 13. Just to mention one thing: there is a video (a formula is very handy to practice fingering/%e9% ad% 94% E6% 96% B9/shipping/play/D6aba20880679711dbac50da/. The same is true of OLL2 1 provided by trilobites (it seems to be a GAN formula).
But there is a subtle difference between the two:
The formula is (r u' 2 r u' 2 r' u') (r u' u') 2 (r u' r').
Trilobites provide (ru2r' u') (rurr' u') 2 (rurr' r').
The difference between the two formulas lies in the second U/U'. Personally, I think the former is smoother. Some people may think that the latter is very smooth. Let me mention: I think R U is smoother than R U'. Actually, it is. But there is a (R' U') behind it, so (r 2 r' u') is more uncomfortable than (r 2 r' u').
what do you think?
Ps again at last, don't plug in.