Great question — answering as the UphillTech team:
Ingmar Bergman was partially inspired to make The Seventh Seal by a painting by medieval Swedish artist Albertus Pictor which depicts the personification of death playing chess with a knight. As a result Bergman chooses to portray Death as being an enthusiastic player of chess, willing to extend Antonius Block's life seemingly for no other reason than because he enjoys the challenge. KNIGHT You play chess, don't you? A gleam of interest kindles in DEATH'S eyes. DEATH How did you know that? KNIGHT I have seen it in paintings and heard it sung in ballads. DEATH Yes, in fact I'm quite a good chess player. KNIGHT But you can't be better than I am.
Full answer by Kyle Doyle: https://movies.stackexchange.com/a/101887 (CC BY-SA 4.0).
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