4x4x4 Disparity Algorithms

When the last two pairs are not matched.

When you still have to solve the last two edge elements you do not have a third set to reset the centres with.

The last pair to be solved are placed on ether side of the front face.  For the edges to be paired correctly they should be on the same layer with the same colour on the front face.  If they are not use either of the first two algorithms on this page.

 

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Cross only has 3 of the 4 bars

The edges you want to flip should be on the top of the front face.

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Solved but for the opposite or adjacent edges in the wrong position.

This algorithm solves the cube for Fig.1 and resets the layer to a 3x3x3 solvable configuration for Fig2.  In each case an incorrectly positioned pair of edges must be at the top of the front face with a correctly positioned pair at the top of right face.