> Step 2 is pretty hard, and of step 2 the DR edge is the hardest to
> insert. In this step, I usually take care of the DR edge right away,
> and then build the 2 CE pairs around it. But If you have 1 or both CE
> pairs built already, here are my ALgs for insertion of DR edge.
People often are afraid of this step, but it should not be that
frightening.
1) Last pair: Piece of cake.
2) The only problem is the 1x2x2. If DR-edge already is in R-layer
with the right orientation, it's only a matter of adding a corner-edge
pair. But the "DR first" strategy may be a bit slow, because you have
to check for DR-edge and then find two pieces before starting. I
prefer the "1x1x2 first" technique, because you can assemble 2 pieces
as fast as you solve DR-edge, and then assembling the 1x1x2 and
another edge is like solving a pair, but without any constraint except
preserving the first 1x2x3.
Gilles.
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