Message #4070

From: Marc Ringuette <ringuette@solarmirror.com>
Subject: Re: [MC4D] 2x2x2x2: Monoflip demo side-by-side with MC4D
Date: Thu, 19 Jul 2018 11:01:23 -0700

Yes indeed, Andy, I use the ROIL version of the same gyro that Melinda
uses (I call that gyro FOro, front-out rotation, because it holds the
front-back and in-out axes fixed).

The algorithm for my ROIL FOro is:   Iy Oy’ RO2 BO2 UO2 RO2.   I show it
in this 1-minute video. https://www.youtube.com/watch?v=3gvrda5fMto

Funny thing is, you almost answered your own question when you observed
that

>  Interestingly, performing *Iy Oy’* on the virtual puzzle corresponds
> to the 4-move sequence Ro2 Uo2 Bo2 Ro2

Since, if you apply your sequence Ro2 Uo2 Bo2 Ro2 and then *Iy’ Oy*, the
result is *FOro’* and the algorithm is the exact inverse of my ROIL FOro.

Cheers
Marc