judo has plenty of ground work - position, submission, etc. there is even a group that focuses mainly on groundwork. In competition, groundwork is allowed - choking and various arm locks. judo has leglocks and spine locks, but they are not allowed in competition.
The thing about groundwork in judo competition is that judo is a sport of action... you will actually get penalized if you don't attack at least every 10 seconds. When you are on the ground, they will let you work for a pin or submission - but you have to work fast. If they think the action is beginning to lull, they will stand you back up. This will happen after about 10-15 seconds, depending on the ref.
on the ground, you may win by submission or by pin - pinning the guy for 25 seconds.
i'm nobody...i'm nobody. i'm a tramp, a bum, a hobo... a boxcar and a jug of wine... but i'm a straight razor if you get to close to me.
-Charles Manson
I will punch, kick, choke, throw or joint manipulate any nationality equally without predjudice.
- Shonie Carter