Edge Orientation
The orientation of edges of the cube, often only EO (edge orientation). Methods such as Roux (6 edges), ZZ (all edges), and Petrus (7 edges) include this as a substep. Also other puzzles such as the Square-1 have EO as a common sub step (EO on a Square-1 is more precisely a separation of edges to the correct layers but it is always referred to as edge orientation.)
Petrus
Edge orientation in Petrus is generally solved with the 2x2x3 block in the back with only R, U, L and F moves. A more detailed explanation can be found in #See also.
Roux
EO Detection
If an LSE edge has the sticker with the color of the U face or the D face facing up or down, it is good/oriented. Therefore, if that sticker is not facing up or down, the edge is bad/unoriented.
Solve EO
The bad edges can be oriented with only M and U moves. The solver usually tries to reduce the EO case to an "arrow" where only four bad edges remain, one in the D layer and the other three in the U layer. This is done because the arrow can be solved with the simple trigger M(') U(') M(') (the exact algorithm depends on the angle). For a more detailed explanation, follow the links in #See also.
ZZ
EO Detection
Looking at the edges on the U face, D face, F face of the E-slice, and B face of the E-slice:
- If the sticker has L/R color it's a bad edge.
- If the sticker has F/B color, look at the sticker on the other side of the edge.
- * If the side sticker has U/D color, it's a bad edge.
Orienting 2 Bad Edges
Place one bad edge on F/B using <R, U, L, D, F2, B2> and then do a F/B quarter turn. Repeat with Orienting 4+ bad edges approach.
Orienting 4 + Bad Edges
Place four bad edges on F/B using <R, U, L, D, F2, B2> and then do a F/B quarter turn. Repeat until there are no more bad edges.
Orienting 6 Bad Edges
Often, 6 bad edges can be oriented more efficiently by placing 3 bad edges into F/B using <R, U, L, D, F2, B2>, performing an F/B quarter turn, and then using the 4 + approach to correctly orient the remaining 4 bad edges.
See also
- Orientation
- Permutation
- Edge Permutation
- Corner Orientation
- EOLine
- ZBLL
- VH Method
- Partial Edge Control
- EO Steps
External links
- Lars Petrus' Petrus EO Tutorial
- Gilles Roux's Roux EO Tutorial
- Kian Mansour's Roux EO Tutorial (text based, more advanced)
- Kian Mansour's Roux EO Tutorial (youtube, mainly for beginners)
- ZZ EO Tutorial (text based)
- ZZ EO Tutorial (youtube)
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