--- In [email protected], "kovacic81"
<[EMAIL PROTECTED]> wrote:
>
> mike, thanks for the encouragement. i read your post and wondered
> about f2b
>
> 10.78, 12.87, 12.31, (23.53), 12.99, 12.65, 18.17, 12.94, 11.17,
> 11.41, 13.18, (10.68) AVG 12.85
Now you've got me curious. I took an average just now, and I can't
say I'm very happy with it. I wish it were a second or two less.
11.43, 9.26, 11.78, 13.62, (8.37), (15.14), 9.09, 14.87, 10.90, 12.43,
13.01, 10.31 = 11.67 average
I've learned two important things: The first, I'm terrible at building
the F2B when there isn't an obvious start. I need to work on being
more flexible. If there isn't a corner edge pair, I don't do as well.
If one is there, though, I get good times. I also tend to hurry too
much when I don't have a solid start planned. I need to work on
slowing down and staying calm.
Also, I make far too many rotations during my F2B. I generally build
the first block in front, because it allows for easy RULMd algs. If I
could learn to make the blocks on L and R I'm sure it could be faster.
> This is a pretty good improvement, but i wont be happy until i'm sub
> 10. On the 23.53, I had a really bad first b. For the 2nd block, i
> did both pairs first and then FORCED myself to do a new alg Gilles
> showed me.
My goal for the F2B is sub-9. I know it can be done, and really
shouldn't take all that much work. The trick is seeing my fewest
moves solution in the 15 seconds...
>
> R' U' R2 U R2 U' R'
>
> y M' U2 M y'
>
> Ur'R'UM'U'R2
>
>
> The last one is Gilles'
> Which one do you guys use?
Wow. That's a great trick! I'm going to have to steal that. This
leads to an interesting point. You can use the last pair or edge to
influence the orientation to your liking, often avoiding that step
altogether, and even more often achieving the easy 3 edges on top
situation. It's not always as easy to see, because of the corners,
but it can be done, I think.
In the end, I would also like to be able to use tricks to influence
either (or both) the edge orientation or the corner case. For 7/32
of cases, you can use what amounts to a VH or ZBF2L alg to orient the
U edges only. For the other 24 unoriented cases, you can try for a
better orientation (such as the 3 edges scenario).
Also, has anyone looked into placing the UF and UB edges after
orienting? A lot of times, this is much easier than trying for UL and
UR, but I don't know if the decision between the two can be made fast
enough. Using this and unconstrained centers (solving slowly, because
I can't speedsolve that way yet), you can achieve almost optimal L6E
solutions most of the time. I tried this for hours earlier and the
nastiest case I found was 19 moves to fix. Only a few sub-10 though.
Another thing to try is placing DB while orienting the edges. This
can usually be done in 7 moves or less. After that, you're left with
5 edges to possibly permute. 1/5 of the time, it's a simple edge PLL,
around 1/10 of the time it's a 3 edge cycle in a slice, and the rest
of the time, it's just two 3 cycles. The average using only MU moves
is around 7, but better if you're smart about solving the DB edge.
Consulting my trusty list of algs for DB and placing using only a
couple algs and some intuition, I averaged 13.9 moves to finish the
edges this way. I imagine with the full list of L5E algs, and
influencing orientation with the last pair or edge and the corners,
this could be reduced to around 12. Perhaps less.
Also, while I highly advocate using MU type algs, I've recently
discovered some simple special cases that I think are useful to learn.
When all but three pieces are placed and oriented, and two of the
wrong pieces are flipped, you can always solve in <10 moves. Usually,
it's 8. The trick is to use commutators. As an example: M'UM D2
M'U'M D2. Does anyone else actively use algs like this?
Anywho, that's about all the spiel I've got for now. Happy cubing.
> Jason K
-Mike
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