King of Endings(1987)

Original title: Kraljeva završnica

Branko Kralj is an alienated businessman and avid chess fan. He is married to the attractive Visnja and they have a son. Their marriage is weak and Branko feels much closer to his mistress than to his wife. One day Kralj and Visnja travel on a half empty train. Kralj goes to a far away compartment for a game of chess, and leaves Visnja alone. Three men take advantage of the lone woman in her compartment and rape her.