In the closing scene of Butch Cassidy and the Sundance Kid, the titular duo is trapped in a farmhouse, surrounded by the Bolivian army and dreaming of far off Australia, where both banks and the armed forces are pushovers.
Our heroic duo’s hideout has only one door, no other apertures. This is a blessing and a curse: as they plot their escape, bullets can’t whiz through windows and cause chaos within. But their opponents can centre their focus on that single point of exit.
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