The Judo World Championship is held every year except for the years of the Olympics. From August 26 – September 1 the 2013 edition was held this year in Rio de Janeiro, Brazil.
According to Judo rules, if a throw is incomplete as in the opponent does not land completely on his or her back, the match continues. If a pin can be made, points are earned however some judoka choose to submit with the permitted chokes and armbars, probably why Olympic judoka Ronda Rousey is now so keen on the submission in her fights.
If no progress is being made in the eye of the referee, the opponents are reset standing so the time on the ground is crucial. Check out this armbar that was done by Charline Van Snick in the recent World Championship in her bronze medal match. As her opponent sets up a throw, Van Snick counters and pulls her opponent back and zeroes in on the arm showing that submissions are often found in counters or reactions: