Which of these films was not based on a true story?

"Rounders", a 1998 American drama film, was not based on a true story. It is about the underground world of high-stakes poker. It was directed by John Dahl with the screenplay being written by David Levien and Brian Koppelman. Ideas fto support the story came from successful poker players who wanted to capture the energy and tension of the game. Matt Damon and Edward Norton are the main stars. The story follows two friends who need to win at high-stakes poker to quickly pay off a large debt. The term rounder refers to a person traveling around from city to city seeking high-stakes card games.

Despite an unremarkable theatrical release, "Rounders" was a commercial success. It grossed $22.9 million US dollars at the box office in the US on a budget of $12 million.

"The Accused", a 1988 American legal drama film, was directed by Jonathan Kaplan with a screenplay was written by Tom Topor. The film is loosely based on facts concerning the 1983 gang rape of Cheryl Araujo in New Bedford, Massachusetts. The resulting trial received US national coverage.

"Amistad", a 1997 American historical drama film directed by Steven Spielberg, was based on true events of 1839 aboard the Spanish slave ship La Amistad.

"A Beautiful Mind", a 2001 American biographical drama, was based on the life of the American mathematician John Nash, a Nobel Laureate in Economics and Abel Prize winner. This film was directed by Ron Howard, from a screenplay written by Akiva Goldsman.