Fergal Keane talks to people who have taken risks and made sacrifices to stand up for what they believe in.
Garry Kasparov was only 22 when he became the youngest ever World Chess Champion. His was a gilded youth, lauded by the Soviet state. Yet he was always known as a bit of a trouble maker, unwilling to tow the party line. His greatest stand, though, would be a very personal one - against Vladimir Putin.
He talks to Fergal Keane about why he decided to stand for the presidency of Russia, a decision that led to his imprisonment. And whether he thinks he will survive as a defiant presence in a country where some critics of the state have met a violent death.
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