From:

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My description of the checkerboard pattern was clearly

inadequate, due to haste and the fact that my cube was "borrowed"

and scrambled before I had a chance to see precisely what was

going on.

The pattern in question is formed from Crux Plummeri by

applying the "Pons Asinorum" transformation; from the

resulting almost-checkerboard, a simple "12-squares" transformation

will provide the 6 checkerboards; it isn't hard to inspect

the almost-checkerboard to find a trio of center cubies to

rotate.

The resulting checkerboards are a completely interlocked

set. In the following unfolded cube, A/B means that the center

and corners are color A, and the edges are color B.

A/B

C/A B/D D/E F/C

E/F

I don't THINK anyone has mentioned this pattern; the checkerboard

pattern mentioned by Greenberg consists of two cycles of three colors

each, something like

A/B

B/C C/A D/E E/F

F/Dalthough I may have the handedness wrong.

Mike -------