They played a long forcing line, and there wasn't much left to play for.
See chess.com's report for the game and some explanations :
https://www.chess.com/news/nakamura-blunders-in-candidates-tournament-2nd-round-9048
What has happened in Topalov-Svidler game?
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I've just started the Candidates broadcast and already see 1/2-1/2 in Topalov-Svidler game. What has happened?!