Pattern Thread

All from Dan Harris' book:

((M'U)*4xy')*3 <-------optimal solution 20 moves :O

U2 R2 U2 D2 R2 U D

U M D2 F2 D2 M' U2 F2 U

L U B' U' R L' B R' F B' D R D' F'

L' F' R' L U D R' D' L' B' U2 L' U' R L U' F2 R'
 
((M'U)4xy')3
If 20 is optimal, that's 36 moves.

Sorry I mis-worded. The way I did it is not optimal but once the pattern has been created it cant be solved in less than 20 moves making it one of the rare cubes that require the full 20 moves to solve. There are millions of such cases but millions/ 43 quintillion = tiny proportion ~ rare :)
 
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