Hi,
Confined spaces is one of my favorite Systema topics. I think the
drills against the wall are pretty well covered in the DVDs. Someone
on the official forum requested confined spaces drills for their
study group. Here are some different kinds of drills from Edgar's
classes at Fighthouse:

1) Draw a line on the ground (or just use a rope or some other
marker), and practice having your partner push you from behind, and
from the front, while you try not to fall over the subway
track/cliff/roof/waterfall/fiery abyss, or other unpleasant drop,
depending on your geographic location. You can start by just
yielding, then move onto the fun of trying to move in such a way that
as your partner pushes you, he flies over the cliff instead of you.
Or, if you must go over, then at least take him with you so you both
die together (Edgar's suggestion!). If you have a pool, you could
really make this one fun!

2) Seat three or more people on a couch. Have the one at one end
attack one person on the other end, while the person in the middle
plays the bodyguard and defends. Then have the one in the middle
attack the one on the end, and rotate the roles around until everyone
has tried sitting in every place and playing the attacker, target,
and bodyguard.

3) One person sits in a chair (sturdy ones are best, we've destroyed
a few plastic ones at Fighthouse with these games!) and the other
attacks with kicks, punches, knife, etc. The one in the chair should
move out of the chair and roll offensively into the attacking person,
or simply fall, or otherwise move out of the chair and go down in
such a way as to bring the attacking person down, too. You can also
roll backwards out of the chair (maybe best to try that on a soft
surface first), remember to lean forward as the back of the chair
hits the floor so your back doesn't crash against the floor. Or you
can rise out of the chair and then use it as a handy weapon...Vlad
shows this with a stool on the DVD. Of course, you can also do this
without moving out of the chair, just seeing what you can use to end
the attack, like using the back of the chair to inflict pressure on
the attacking arm. I think with some creativity, you could alter the
game of Musical Chairs to be a Systema drill, maybe have on less
chair than students, and when the music stops, use any reasonable
means to ensure that you have a seat.

4) At summer camp, we practiced sparring among the trees. Trees are
excellent training partners. They are confined spaces and the
slapping branches can be painful, almost like having a third person
involved in the practice. Vlad showed us how to use the branches to
trap our partners as they attacked. Be careful not to get trapped
yourself, and also practice sliding underneath the branches and going
deeper into the tree. But try not to be too hard on the trees, and
thank them afterwards for helping you with your training.

I think one good way to develop drills might be to choose anywhere
you might be sitting or standing: a chaise lounge, phone booth, bar
stool, in bed, at the fridge with door open, in your coat closet,
brushing your teeth, etc. and see what sort of opportunities arise
from those spaces. It's too bad that no one has a sort of Hogan's
Alley house where we can let loose and destroy furniture or throw
canned goods or improvise a weapon from a toothbrush. Now that would
be fun! Maybe a hallway or garage or toolshed could be used for some
of these drills so as not to rough up the house too much. Now, if you
have kids and must tell them, "No roughhousing indoors," they aren't
going to believe you anymore!

*Vsego nailuchshego* (best wishes),
Rachel