# A Comprehensive Guide to Petrus

#### mukerflap

##### Member
a way to do 2x2: make roux first square with a pair in the back and solve the last edge
i got a 1.11 2x2x2 ao12 with this method and the 222 is always in LBD with 0 rotations and nice ergonomics and its still efficients

#### PapaSmurf

##### Member
Doing it the same way every time isn't a great idea. Of course, being able to do it that way as a fall back stratergy is good, but what you'll find is that maybe a third of the time, that will be the best approach, about a third will be the same thing but the square is on U and another third with the square on D, along with a few special cases.

#### 2180161

##### Member

Old guide of mine, but still relevant given the post I'd say.

#### PetrusQuber

##### Member
Took a break from writing this guide, starting again.

#### TheSlykrCubr

##### Member
is petrus eo the same as zz eo?

##### Member
Not quite, Petrus EO is where you do RUL moves to orient edges and you rotate y' at the end and ZZ EO is where you don't rotate at all and do B and F moves to orient the edges, so basically Petrus EO is just ZZ EO off by a y'.

#### TheSlykrCubr

##### Member
can you give me help with petrus eo, I know how to do zz eo

##### Member
The last section is only a bit messy. I'd separate 2x2x2 and 2x2x3 + "How to improve" from the "Inspection" and "common cases" sections. (I haven't read them yet, but having nested spoilers is not really nice).
Also, don't forget the block trainer

#### TheSlykrCubr

##### Member
that was nice and very helpful

#### ObscureCuber

##### Member
Petrus EO can also be algorithmic (Kinda like f2l as an example)
While ZZ EO will almost always be Intuitive(Like Cross)