Tblisi, Georgia.
Yarygin is very very tough, and has kind of replaced Tblisi, but not the same tournament. Maybe similar levels of competition?
For one thing, Tblisi is where the Soviet elites would often vacation. Yarygin is in Siberia- definitely not a vacation getaway!
Smith went 1-2 in Tblisi in January 1986. He lost to Isayev (USSR) 11-5. He went on to defeat Isayev in the Goodwill Games (6-3; July '86) and World final (5-4 August 1987.)
If I remember the story correctly, he credits the Tblisi tourney experience as a turning point in his career; also I think this is also may be where Dave Schultz noticed that Smith had "something" that would make him great. (I listened to an interview a couple years ago)