One of the most profound additions to my aikido practice, in my humble opinion, has been the development in our system of what we commonly refer to as "chained series" or renraku waza. The concept isn't new, of course, but I don't know that many people practice it in aikido (help me out if I'm mistaken, I'd love to take a look at what others are doing).
Basically, you would start off with uke either attacking or grabbing a wrist. Tori performs technique A, uke falls down (or submits). Then you do it again, but this time uke attempts to escape or counter technique A, so tori moves on to B, so on and so forth.
Many of these chained series can get rather long, upwards of 9 or 10 even. When it comes right down to it, there are probably an infinite number of ways you can combine them, but the main idea is to practice flowing from one thing to another, to follow uke, to keep from getting attached to making a single technique work, by golly, blah, blah, blah.
Anyway, while I've enjoyed the benefits this has had on my aikido, I've often wished we had a similar sort of chain series for judo. So far, the only judo renraku waza I can find consist primarily of combining two throws, and that's it (again, if you know of any exceptions, holler).
Sooooo, off and on over the years I've made my humble attempts at doing just that. Here's a few we worked on this morning that I've been playing with:
Hiza guruma series
1) Hiza guruma
Start by doing—you guessed it—hiza guruma, using your right foot. Do the throw for real a number of times, with uke taking the fall.
2) Okuriashi harai
Okay, now uke tries to step through with his left leg (tori has to honestly try to make hiza work; you can't half-ass any of these just because you're moving on to another throw). Tori puts his right foot back down, toes pointed out and uses his left foot to sweep uke's trailing leg with okuriashi harai.
From here, we can get two possible throws:
3a) Sasae tsurikomi ashi
Let's say tori misses the timing, uke's foot is already stopped and solid, and tori ends up just kicking a tree trunk. Now tori puts his left foot back down, pre-turned, toes pointed at uke and next to uke's right foot. Tori then uses his right foot to throw sasae tsurikomi ashi. And just for fun, here's a great video of said throw (although from the other side):
Here's another possibility:
3b) Kosoto gari
Maybe uke knows the double foot sweep is coming and he pulls his right foot back and out of the way after the failed hiza, which means tori totally whiffs it, his left foot hitting nothing but air. Tori shouldn't just put his foot down anywhere, though. Place it immediately next to uke's left foot (on the outside), and switch your grips (assuming you've had your right hand on uke's collar, and left hand on his elbow, you'll want to reverse that). Tori uses his right foot for kosoto gari. This is a sweet one, rarely expected.
There's more, of course, but I'll get to that later.
I'm a student and instructor at Windsong Dojo in Oklahoma City, OK, where we study a non-competitive style of Tomiki Aikido, as well as Kodokan Judo, and Seitei Jodo. I've been studying budo for 19 years, and I hope to study many more. Welcome!