4x4 - Reduction Method

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Pair up an edge.

Pair up one set of edge pieces.

Case 1

d R F' U R' F d'

Case 2

u'

Store the edge.

Move the pair into the up or down layer. Then repeat pairing and storing for first eight edges.

Only Case

R U' R'

Solve Last Four Edges

Pair up the last edge pieces using some algorithms.

Case 1

d R F' U R' F d'

Case 2

(R F' U R' F) (d R F' U R' F d')