I definitly quoteThat solution is incredible, the F2L-1 is simply ''. You've shown me that 2 twisted corners aren't as bad as I thought.amazing solve !
I definitly quoteThat solution is incredible, the F2L-1 is simply ''. You've shown me that 2 twisted corners aren't as bad as I thought.
Originally Posted by kinch2002
20 move FMC
[22:50] <+Kirjava> scramble: R F U2 R2 U L2 D2 L2 F' L' F' B' L2 B2 D F' U2 R F' D2 F2 L' B' D F'
F2L-1: L2 B' F' R F D2
Continue: D L F L' F2 D F D2 L (2 twisted corners left)
So the skeleton is: L2 B' F' R F * . D' L F L' F2 D F D2 L (14)
Insert F' R' F L F' R F L' at * to cancel 6 moves (standard conjugate cancellation)
Insert L' U' L D' L' U L D at . to cancel 4 moves
Solution: L2 B' L F' R F L2 U' L D' L' U L2 F L' F2 D F D2 L (20 moves)I note that these 20-move solves are sub-optimal by 5 moves, as the scramble is a somewhat rare 15f*.My solution also 20 moves
F2U2BF’L’U’FU’R’F2L2B2L’FB’U2FB’RF2
F2U2BF’L’U’FU’R all corners and 5 edges,
R2F2L2B2L’FB’U2FB’RF2 2 edges swap , L5E.
Only about 1 in 437 positions are solvable in 15 moves or less.
I agree, this was a very easy scramble, i do not want overestimate.
I post my PB... I've done it monthes ago with an easy scramble...
Scramble: U' F' D R2 D' U' B' L' D2 U' B' F L' B2 L' D' U2 L' R2 U F2
x-cross: U' B L' F'
extend to double x-cross: U B2 U' R B' .
third couple: U' B U2 B' R'
L3C: U B U B' U' R' U2 R
insert at . canceling 3 moves B U F' U' B' U F U'
full solve: U' B L' F' U B2 U' R U F' U' B' U F U2 B U2 B' R' U B U B' U' R' U2 R
27 HTM...
I was trying this scramble...
D B2 D' U R' D L2 U' D2 B2 L B2 L' B F U' B' U' L' U R2 U' B F2 D
I found premove F2...
switch to the inverse
double x-cross: F R' D2 R D' R2 D' F' U2 (9)
I can't go on... after 55 minutes I decided to post just this... -.-''
I think it's a good start...
I often fail at continuations after a nice start... suggestions?
Yes, I figured you knew this was a specially picked easy scramble, and I am not really trying to belittle the fact that you and kinch2002 have found 20-move solutions. My congrats on these good solves.
However, I like to think of number of moves over the optimal solution as another meaningful way of measuring "how good" a solution is. By this way of measuring, there are probably several better solves from WCA and online competitions.
I note that what the Wiki indicates the unofficial record is 19 moves, and that was done by Mirek and Guus on a 18f* scramble. So that solve (both of them arrived at essentially identical solutions) was only one move more than optimal. I think it's highly unlikely there has been a 20-move solution on a 20f* scramble. (20f* positions are so rare, it is unlikely that one has ever occurred in an online or WCA competition.) So one move above optimal seems to be the unofficial record, and I would imagine several 2-, 3-, and 4-moves over optimal solves have been done in online fewest moves competitions (and two in official WCA competitions).
Looking back at Per's FMC web site (back as far as #250), I actually find only one sub one hour solution that is better than optimal+5 (disregarding solves generally thought not to be legitimate). (The 19-move solves were on #203.) That was a 22-move solution on #300, which was an 18f* position. The "classic" format (allowing a whole week) has a few such solutions including three 20-move solutions on 17f* positions (optimal+3) - #309, #348, #356. The two WCA world record solutions were both 22-move solutions on 18f* positions (optimal+4). I haven't checked through the weekly competition results on this site, but I would guess there are some more examples there.
EDIT: Looking back farther in Per's FMC web site, there was a 20-move solution (in half an hour) on an 18f* position in round #235 (optimal+2 sub one hour).
Last edited by cuBerBruce; 11-28-2011 at 09:27 PM. Reason: Append
F R B' D2 L D' R U' F' U2 L B2 D' F U2 F' R U' B U D' F' B2 R2 B'
x-cross: U B2 L B' (4)
extending to double x-cross: L D L' (3)
F2L-1+EO: R' D R' D R .F D': F' (8)
Leave 5 Corners: D' B' D' B D' (5)
. U F D F' U' F D' F' (8-3 = 5)
: L B' L' F' L B L' F (8-2 = 6)
L5C in 20 moves with two 8 moves insertions that cancel 5 moves... 20+8+8-5 = 31 HTM
full solution
U B2 L B' L D L' R' D R' D R U F D F' U' F D2 L B' L' F' L B L' D' B' D' B D'
31 HTM
Very Nice but you missed an opportunity
Your start:
x-cross: U B2 L B' (4)
extending to double x-cross: L . D L' (3)
R' makes a pair
D : F D' F makes F-1
D2 R' B R B' makes EO + pair
B' D2 B D2 leaves 4 corners with 1 twist
at . insert L' U2 L D' L' U2 L D to cancel 3 moves
at : insert D' L U2 L' D L U2 L' to cancel 4 moves
final solution
U B2 L B' U2 L D' L' U2 L D2 R' U2 L' D L U2 L' F D' F D2 R' B R B2 D2 B D2 = 29 HTM
WTF!?? congrats!Very Nice but you missed an opportunity
Your start:
x-cross: U B2 L B' (4)
extending to double x-cross: L . D L' (3)
R' makes a pair
D : F D' F makes F-1
D2 R' B R B' makes EO + pair
B' D2 B D2 leaves 4 corners with 1 twist
at . insert L' U2 L D' L' U2 L D to cancel 3 moves
at : insert D' L U2 L' D L U2 L' to cancel 4 moves
final solution
U B2 L B' U2 L D' L' U2 L D2 R' U2 L' D L U2 L' F D' F D2 R' B R B2 D2 B D2 = 29 HTM
also if my skeleton is 1 move shorter! :P I didn't see that solution..
It's often easier and faster to find another good start for which continuations are easier.
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