Liz Garbus is working on a documentary for HBO titled Madman Genius. It centers on Bobby Fischer, described by Garbus as "sort of the Muhammad Ali of chess." The film is in pre-production, with shooting to start probably this spring. Liz Garbus is working on a documentary for HBO titled Madman Genius. It centers on Bobby Fischer, described by Garbus as "sort of the Muhammad Ali of chess." The film is in pre-production, with shooting to start probably this spring.