// guide ── eo (4a)

EO — Edge Orientation

The first sub-step of LSE is to orient the last six edges.

For EO, we look only for U/D colour stickers of the last six edges and we treat both up and down the same.
LSE is solved using only M, U moves.

How to read EO

An edge is oriented when its U/D-colour sticker points up or down when centers are in their canonical position.

Bad-edge counts always come in even numbers (0, 2, 4, 6). This information is helpful because you don’t see the DB edge but you can tell it’s oriented just by looking at the remaining 5 edges that are visible.

The arrow

The arrow is the EO case with three bad edges on top and one bad edge on the bottom. All EO cases are solved by reducing them to an arrow case.

The only way to change edge orientation is U/U’ move when centers are misoriented (U/D center pointing forwards/backwards). The U move flips orientation of all 4 edges in U layer.

Arrow — M' U' M

Solution M' U' M

M' brings all 4 bad edges into U layer while misorienting centers.
U' orients edges.
M returns centers.

All EO cases

Each case is named by its top / bottom bad-edge counts (T/B), with a (adjacent) or o (opposite) describing the top pair when there are two.

Arrow

Solution M' U' M

Arrow (mirror)

Solution M U' M'

Use the even bad-edge rule to recognize this case without having to peek the DB edge.

2a/2 — the M2 case

Solution M2 U' M U' M

2a/0

Solution M U M' U2 M U' M'

2o/0

Solution M U M' U' M U' M'

4/0

Solution M U2 M' U2 M U' M'

M U2 M' switches UB and DB edges.

2o/2

Solution M U2 M' U2 M' U' M

1/1

Solution M U M' U M U' M'

1/1 (mirror)

Solution M' U' M U' M' U M

0/2

Solution M U M U' M' U' M'

4/2 — 6-flip

Solution M U M U M' U M' U2 M U' M'

Reduces to a 1/1, then to an arrow.

Where to next

UL/UR guide — place the UL and UR edges, the next step of LSE.

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