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Optimal cross

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ao5

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Puzzle
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Scramble

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    Scramble

    Check your cube against it. Drag the 3D cube to turn it.

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    Roux

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    Step 1 of 6

    First block

    What you should end up with

    A 1×2×3 block in the bottom two layers of the left face: a centre, three edges and two corners. There are no formulas here: you build it by understanding it.

    How to do it

    1. Look at the scramble and pick the block: white on the bottom and red on the left, as in the diagrams. You can vary the colours later.
    2. Any move is allowed, but do not rotate the whole cube: use wide moves such as r and u instead.
    3. Build the block in parts. Usually that is the bottom edge and two corner-edge pairs, or a 1×2×2 square and one pair. The ways are shown below.
    4. Plan ahead. Start by finding the moves up to the square, and look for the last pair while solving.

    Three ways to build the block

    3D
    The bottom edge first L' D' places the bottom edge. r' brings the back pair to where it can go in. B2 and F' insert both pairs.
    L' D' r' B2 F'
    3D
    A 1×2×2 square first F places a side edge and D2 completes the square. R U' prepares the last pair and B inserts it. Handy when an edge already sits next to the centre.
    F D2 R U' B
    3D
    Two lines D' B builds the bottom line: an edge and two corners. U r' builds the middle line: a centre and two edges. u joins them.
    D' B U r' u

    How to insert a pair

    3D
    The pair forms on the bottom The edge is at the bottom front, and the corner's white sticker faces right. R' brings the corner to the edge and F inserts the pair.
    R' F
    3D
    The pair forms on the right The edge is in the middle layer at the front right. U puts the corner above it, and F2 carries the pair into place.
    U F2
    3D
    The edge is flipped R U2 takes the corner to the top left. M' lifts the edge to it and flips it, and F' inserts the pair.
    R U2 M' F'

    If the centre is off

    3D
    Everything is built around the wrong centre Insert the last pair as if the centre were right. Here the centre you need is on the bottom, and E M' E' puts it in place without breaking anything. If it is on top, use E M E'.
    F' U F' E M' E'

    Tips

    ›Inserting a pair takes four moves at most and ends with F for the front pair or B for the back pair.
    ›A first target: the block in under 13 moves. Then under 10. Experienced solvers need under 9.
    ›Once the block stops taking many moves, try different colours on the bottom and left: more choices give shorter solutions.
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