Sorry to keep you waiting.
Now I'm back to the hotel and as a first thing to do I came here.
I am pretty happy to announce that the longest official world record (Fewest Moves: 22 moves)
has been finally broken as follows.
Scramble: L' F2 R B2 D2 L' B2 U B2 L B' R' U B2 D' R U B' (18f)
Solution: L2 U2 L F' U' F2 U D' B' R2 F2 D B2 D' U F D F' U' F (20f)
Spoiler:
NISS solve.
(Inverse)
Pre-scramble: L
2x2x3 block: B2 D' F R2 B D
(Normal)
Pre-scramble: D' B' R2 F' D B2
All but 4 corners: L2 U2 L F' U' F2 U
Correction: D' B' R2 F' * D B2
Insert at *: F' D B2 D' + F D B2 D'
Insert at +: U F D F' U' F D' F'
I got the 13-move skeleton in 19 min., and wrote down the 20-move
final solution in 50 min. Then I checked the solution again and again,
and was satisfied in 55 min. I brought my sheet to Ton Dennenbroek and
reported my result.
Thanks to everyone, I finally did it!
But as Mike Hughey said, it is not the end, but surely this record will be further broken.
The next world record is under God's number! 作者: wpolly 时间: 2012-7-14 16:18:58
Scramble: L' F2 R B2 D2 L' B2 U B2 L B' R' U B2 D' R U B' (18f)
Solution: L2 U2 L F' U' F2 U D' B' R2 F2 D B2 D' U F D F' U' F (20f)
Spoiler:
NISS solve.
(Inverse)
Pre-scramble: L
2x2x3 block: B2 D' F R2 B D
(Normal)
Pre-scramble: D' B' R2 F' D B2
All but 4 corners: L2 U2 L F' U' F2 U
Correction: D' B' R2 F' * D B2
Insert at *: F' D B2 D' + F D B2 D'
Insert at +: U F D F' U' F D' F'
解法解释:
先正序打乱:L' F2 R B2 D2 L' B2 U B2 L B' R' U B2 D' R U B' (18f) 然后发现情况很不好,很乱。
于是逆打乱:B U' R' D B2 U' R B L' B2 U' B2 L D2 B2 R' F2 L
然后做 B2 D' F R2 B D 完成一个2x2x2 和一个1x2x2
然后我们就知道可以通过一个在逆打乱前的预打乱 L 使之变成2x2x3
于是
Pre-scramble: L
scramble:B U' R' D B2 U' R B L' B2 U' B2 L D2 B2 R' F2 L
做 B2 D' F R2 B D 就完成了一个2x2x3
这里的B2 D' F R2 B D 这是NISS
于是,我们可以把NISS的逆序作为预打乱 D' B' R2 F' D B2
然后正打乱 L' F2 R B2 D2 L' B2 U B2 L B' R' U B2 D' R U B' (18f)
在NISS中的预打乱的逆序 L' 就成为解法的第一步。
解法变成L' L' U2 L F' U' F2 U
就剩下四个角。
接着:
打乱 L' F2 R B2 D2 L' B2 U B2 L B' R' U B2 D' R U B' (18f)
解法 L2 U2 L F' U' F2 U D' B' R2 F' D B2
此时剩下四个角,开始找插入。
L2 U2 L F' U' F2 U D' B' R2 F' * D B2
Insert at *: F' D B2 D' + F D B2 D'
Insert at +: U F D F' U' F D' F'
或者用奇遇的网页找插入
(1)结果 需要插入2个角块三循环
L2 U2 L F' U' F2 U D' B' R2 F' [@1] D B2
在@1处插入: F' D B2 D' F D B2 D'
插入第1个后: L2 U2 L F' U' F2 U D' B' R2 F2 D B2 D' [@2] F D
在@2处插入: U F D F' U' F D' F'
最少步数: 20 消去9步
完整解法: L2 U2 L F' U' F2 U D' B' R2 F2 D B2 D' U F D F' U' F
用时2.136毫秒
(2)结果 需要插入2个角块三循环
L2 U2 L F' U' F2 U D' B' R2 F' [@1] D B2
在@1处插入: F' D B2 U D' F D F' U' F B2 D'
最少步数: 20 消去5步
完整解法: L2 U2 L F' U' F2 U D' B' R2 F2 D B2 U D' F D F' U' F
用时5.744毫秒