Hello Lars and Everyone I think that making a 3x2x2 in one look is hard. 7 pieces to track. The cross is 4(CFOP). The White Corners is 4 (waterman). THE 2x2 is 4 pieces as well. Extended Cross (2x2 plus 2 edges) is 6 pieces. Not as hard as a 3x2x2, but still pretty hard.
My approach to Petrus is to do a 2x2 and track a corner. SO 5 pieces. A 3x2x1 is also 5 pieces. I can do it in 1 look roughly 30-40% of the time. Most of the time, I can only form a 2x2x1 and track the other 2 pieces. Either way, a ROUX block is usually pretty quick; about 9-10 moves. WHAT Is the Avg move count for a 3x2x2? (same 4 blocks) WHAT is the Avg move count for a 3x2x1? (same 4 blocks) I use white/red white/orange yellow/red and yellow/orange I've seen calculations for the optimal cross solve. MATH people, can you help me? THank you JASON K --- In [email protected], Lars Petrus <[EMAIL PROTECTED]> wrote: > > On Jan 21, 2006, at 3:49, Johannes Laire wrote: > > --- In [email protected], "kovacic81" > > <[EMAIL PROTECTED]> wrote: > >> HOW Many people have avgeraged sub 20 with petrus? > >> > > > > At least three: Anthony Hsu (17.65), Johannes Laire (18.96) and Kyle > > Allaire (19.85) > > Gilles Roux was under 20 too, before he had to go found his own cult. > There may well be more. One of my goals for the year is to learn the > Roux method. It only seems polite. And doing U and slice moves is the > fastest thing I can do with a cube. > > I plan to get sub 20 too one day. I was pretty close on the plane to > Orlando. And I did my best time ever the other day, 13.98. So there's > still hope. > > >> For Petrus Solves, I figure out the 2x2 (which I think is easier that > >> the cross). I decide which corner I am going to use for the 3x2x2 > >> ahead of time. As I do the 2x2 (which becomes automatic after time), > >> I watch my CHOSEN CORNER. Then I quickly throw it in, and have 2 > >> quick edges to insert, finishing the 3x2x2. > >> > > > > I think that 2x2x2-block is much harder than cross, but maybe I'm just > > too bad. That 'chosen corner' -thing is quite similiar to what I do. > > The cross seems much harder to me, since it's so spread out. But I'm > very biased in my experience, of course. If you're a beginner, I can > see how the cross is simpler, since the pieces don't interact much. > > >> > >> WHAT IS A GOOD TIME FOR A 3x2x2? > > I've actually never measured this, but I did some quick timing right > now, and here are my (stackmat) numbers > > 2x2x3: 7.45 7.36 6.53 6.47 7.51 > 2x2x3 + OE: 6.55 14.68 7.22 8.71 9.00 > > If we ignore the blackout, I seem to do roughly 7 for the 2x2x3 and > 8.5 including edge orientation. I you do 6 and 10, it sounds like you > could squeeze 1-2 seconds out of your step 3 without too much trouble. > > I usually meld step 2 and 3 together a bit in that I fix one pair of > edges while finishing up the 2x2x3. Then there's usually only 1 pair > left. > > I normally plan out the full 2x2x2 during preinspection, and usually > while perforning that, I'll spot something more or less good to > continue with. Just putting the corner in place is not optimal in > number of moves, and I never do that, but I can see how it simplifies > things in a way. > > My plan/dream is to plan out the full 2x2x3 during preinspection. It > shouldn't be too hard if you work at it. I think practicing by > planning it all out in your mind and then executing it without > looking would be a good way. Once you can do it, you just need to get > it down to 15 seconds. And the blindfold experience should make it > easier to look at THE OTHER pieces while executing it and be ready to > continue very quickly once it's done. I'll probably never get around > to this, but at least I have a dream. > > > - - - - - - - - - - - - > "He who refuses to do arithmetic is doomed to talk nonsense." > --- John McCarthy > > Lars Petrus - [EMAIL PROTECTED] http://lar5.com > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/speedsolvingrubikscube/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
