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Advanced F2L – Efficiency vs Lookahead

January 15, 2020


There is a slight trade off between move efficiency
and lookahead so in this video I’m going to explain that trade off. In the intermediate module I talked about
reducing your move count, but now I need to explain there can sometimes be a trade off
between lower move count and lookahead. There are some F2L algorithms which can be
really efficient to solve pairs but can disrupt your lookahead and mess up the actual flow
of your solve. For example if we have this case where we have the edge in the back left slot and this corner piece is facing upwards, the cross color is
facing upwards in the front right slot here. There is a really easy way to do this which
goes R2 u R2 u’ R2, like that I did use this algorithm a lot in
my F2L solving but I kind of realised throughout time that it really messed up my lookahead
and the overall flow of my F2L so I wouldn’t suggest using things like that during your
F2L. Another algorithm that is commonly used to
insert an F2L pair is if it’s in the back left here like that, and we have these two
stickers matching and our cross color is on top people sometimes do the algorithm R2 U2
R’ U’ R U’ R2, like that. So in both cases – in the previous example
and in this case the actual F2L solutions for those two pairs were very efficient and
use less moves than you would if you were solving it intuitively or with your normal
solving technique. However, when you do F2L algorithms that actually
bring the cross edge and move it around in the top layer like in those examples, doing
those algorithms makes lookahead much harder because it actually hides your F2L pieces
and then makes them reappear and perhaps sometimes that can be in different locations. So that’s why I would caution against actually
using algorithms like that because even though they’re very move efficient, they’re quite bad
for your lookahead because of how they hide pieces. For any F2L pair that you solve – when you solve
it only by bringing one slot into the top layer it will only affect the pieces in that
slot and the pieces around the top layer. Generally if you are quite comfortable with
F2L it can be easy to track the next pair if the solution for the pair that you’re
currently solving only uses for example the R face and the U face as well. In summary, you want to make it easy for yourself
to track other pieces whilst you’re solving. So solve F2L pairs in ways which make it easy
to track other unsolved pieces and not in ways that hide or move pieces in unconventional
ways.

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