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# Untitled

a guest Sep 20th, 2013 138 Never
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1. Solving The Rubik's Cube in 20 Seconds - Chris Hunt - Github
2.
3. * steps
5.   - turn the cube
6.     - the centres don't move, they are your reference point
7.     - two types of pieces, edge pieces in layers, and corner pieces (8x 4 on top layer, 4 on bottom layer)
8.     - learn algorithms
9.     - master it
10. - algorithms
11.   - notation
12.     - r -right, u - up, l -left, d - down, f - front, b - back
13.     - all moves clock-wise
14.     - M move notation ( middle slice one turn clockwise)
15.     - prime notation means move counter-clockwise
16.   - trivia
17.     - 43 quintillion 43,252,003,274,489,856,000 positions on a rubik's cube
18.   - 2-cycle solution (aka Bicycle)
19.     - focuses only on two pieces at a time
20.     - solves in about 2 minutes
21.     - requires set-up, fix and undo
22.     - four steps
23.       # swap edges (only focusing on two pieces at a time) algorithm is noted -  R U R' U' R' F R2 U' R' U' R U R' F'
24.         - praxis
25.       # swap corners (again focusing on two pieces at a time) algorithm is noted - U F R U' R' U' R U R' (I couldn't type it out fast enough before he changed the slide so it's incomplete, he's going to publish the slides)
26.         - praxis
27.       # rotate edges (again focusing on two pieces at a time) algorithm is noted - M' U M' U M' U2 M U M U M U2
28.         - praxis
29.       # rotate corners (again focusing on two pieces at a time) algorithm is noted - R' D R F D F' U' F D' F' R' D' R U
30.         - praxis
31.   - ruby gem (chrishunt/rubiks-cube)
32.     - kociemba two-phase solution
33.       - breaking down the solving into two pages, scrambled -> oriented -> solved
34.       - eval. sum of moves in first and second steps
35.     - cube explorer is an interactive program to solve and practice
36.   - algorithms to solve rubik's cube in 20 seconds
37.     - techniques: fridrich, petrus, roux, zz (or you're a genius)
38.     - recommend fridrich because it's the most popular (great natural progression from the bicycle solution)
39.     - fridrich is also known as CFOP
40.       - cross, solving four edge pieces
41.       - f2l, first two layers... build up from the cross and solve the two layers at the top and bottom of the cube
42.         - set-up and undo moves are all you need for this... and practise
43.         - praxis
44.       - oll (orient last layer)
45.         - take all pieces in the last layer and flip them
46.         - you'll need to memorise 57 algorithms (however, you've already learned two and that's all you need to complete... the others will make you faster)
47.       - pll (permute last layer)
48.         - take all pieces that are facing the correct direction in the last layer and move them to the right spot
49.         - 21 algorithms (however, you've already learned two and that's all you need to complete.. the others will make you faster)
50. - trivia
51.   - current world record is 5.55 seconds, set this year in March
52. - final steps: refine all the things
53.   - mastered friedrich
54.   - lubixcube.com (speed cubes w/ mods)
55.   - new stickers from cubesmith.com
56.   - bit.ly/gogaruco for silicone lubricant (for lubing the cube)
57.   - speedstacks.com for competition timer
58.   - speedsolving.com is a great community
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