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The Catalan is a chess opening where White adopts a combination of the Queen's Gambit and Réti Opening: White plays d4 and c4 and fianchettoes the white bishop on g2. The Catalan came to prominence at the top level when both Garry Kasparov and Viktor Korchnoi played it in their Candidates Semifinal match (part of the process to determine who would challenge world champion Anatoly Karpov for the title) in London in 1983: five games of the eleven-game match were Catalans.
With its use by Vladimir Kramnik, the Catalan has recently gained a good deal of attention by high-level GMs. Kramnik played the opening three times in the World Chess Championship 2006. The Catalan was also played four times by Viswanathan Anand in the World Chess Championship 2010. (from Wiki)