- Solving The Rubik's Cube in 20 Seconds - Chris Hunt - Github
- * steps
- - buy a cube
- - turn the cube
- - the centres don't move, they are your reference point
- - two types of pieces, edge pieces in layers, and corner pieces (8x 4 on top layer, 4 on bottom layer)
- - learn algorithms
- - master it
- - algorithms
- - notation
- - r -right, u - up, l -left, d - down, f - front, b - back
- - all moves clock-wise
- - M move notation ( middle slice one turn clockwise)
- - prime notation means move counter-clockwise
- - trivia
- - 43 quintillion 43,252,003,274,489,856,000 positions on a rubik's cube
- - 2-cycle solution (aka Bicycle)
- - focuses only on two pieces at a time
- - solves in about 2 minutes
- - requires set-up, fix and undo
- - four steps
- # 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'
- - praxis
- # 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)
- - praxis
- # 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
- - praxis
- # 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
- - praxis
- - ruby gem (chrishunt/rubiks-cube)
- - kociemba two-phase solution
- - breaking down the solving into two pages, scrambled -> oriented -> solved
- - eval. sum of moves in first and second steps
- - cube explorer is an interactive program to solve and practice
- - algorithms to solve rubik's cube in 20 seconds
- - techniques: fridrich, petrus, roux, zz (or you're a genius)
- - recommend fridrich because it's the most popular (great natural progression from the bicycle solution)
- - fridrich is also known as CFOP
- - cross, solving four edge pieces
- - f2l, first two layers... build up from the cross and solve the two layers at the top and bottom of the cube
- - set-up and undo moves are all you need for this... and practise
- - praxis
- - oll (orient last layer)
- - take all pieces in the last layer and flip them
- - 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)
- - pll (permute last layer)
- - take all pieces that are facing the correct direction in the last layer and move them to the right spot
- - 21 algorithms (however, you've already learned two and that's all you need to complete.. the others will make you faster)
- - trivia
- - current world record is 5.55 seconds, set this year in March
- - final steps: refine all the things
- - mastered friedrich
- - lubixcube.com (speed cubes w/ mods)
- - new stickers from cubesmith.com
- - bit.ly/gogaruco for silicone lubricant (for lubing the cube)
- - speedstacks.com for competition timer
- - speedsolving.com is a great community

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Sep 20th, 2013
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