Rubik Cubes For Geeks

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Give a broad overview on Rubik's cube. From structure to competition rules.

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Rubik Cubes For Geeks

  1. 1. Rubik Cubes For Geeks http://bit.ly/rubikcube Barcamp Singapore 4 21th Nov 2009 Benson & Hong
  2. 2. Overview Origin Structure Notations Techniques Speed Cubing Competition
  3. 3. Once Upon A Time... Erno Rubik Professor of Architecture Invented in 1974 Original color scheme (White, Yellow, Red, Orange, Blue, Green)
  4. 4. Structure 6 faces 8 corners (3 colors) 12 edges (2 colors) 6 + 8 + 12 = 26 cublets 6 springs pulling the 6 centre cublets
  5. 5. Speak The Language R - Right face clockwise L - Left face clockwise U - Upper face clockwise D - Down face clockwise F - Front face clockwise B - Back face clockwise R' - Right face anti-clockwise F' - Front face anti-clockwise B2 - Back face 180 degree U2 - Upper face 180 degree
  6. 6. Techniques Layer-By-Layer Most popular E.g.Toy R' Us booklet, Fridrich Block Building E.g. Lars Petrus, Roux Corner First E.g. Waterman Mathematical Rubik's Cubic Compendium (Recreations in Mathematics)
  7. 7. Need For Speed Look ahead Finger tricks Lubing
  8. 8. Lube Your Cube Bad Methylene Chloride Acetone WD-40 (good sticker remover ) Good Silicon spray
  9. 9. Competition World Cube Association (http://www.worldcubeassociation. org) Rules and Regulations Judges, scramblers, score takers Speed cubing, single hand, blindfold, feet cubing, ... "Competitors must bring and use their own puzzles. Competitors may borrow puzzles from other competitors..." Max. 15s inspection
  10. 10. DEMO
  11. 11. Fridrich Method 1. Bottom Cross 2. F2L (First 2 Layers) = 4 x (corner + edge) 3. OLL (Orientation of Last Layer) + PLL (Permutation of Last Layer) Characteristics Popular! Need memorization Many variations for last layer
  12. 12. Lars Petrus Method 1. 2x2x2 2. 2x2x3 3. Fix bad edges 4. Finish first 2 layers 5. Positions corners 6. Twist the corners 7. Position the edges Characteristics: Freedom in movement Less "breaking" of what you have done Fewer moves (3x3x3 Fewest Moves Category 2005 World Championship)

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