A.W. Vidmer won the best director award at the San Diego Film Festival for this movie. As near as I can tell, the movie has not been released to the general public yet, and it has only been showing at film festivals. I'm hoping it will be released soon, because I'd like to see it.
Here are a couple of links: Stu Ungar Movie Official Site and Rotten Tomatoes Stu Ungar Movie Page. And I wrote an article about Stu Ungar here.
