From reid@math.berkeley.edu  Mon Aug 23 04:10:58 1993
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Date: Mon, 23 Aug 93 01:10:56 PDT
From: reid@math.berkeley.edu (michael reid)
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To: cube-lovers@life.ai.mit.edu
Subject: Re:  Diameter of cube group?

> Continuing and waiting for a config that requires 21 turns, dik

here's a pattern to try:
first do 6 checkerboards of order 2 (F2 B2 R2 L2 U2 D2) and then do
superfliptwist.  in other words, the group product of these two elements.