Grünfeld Defence  The Grünfeld Defence ("ECO" codes D70–D99) is a chess opening characterised by the moves:  Black offers White the possibility of cxd5, when after ...Nxd5 White further gets the opportunity to kick the black knight around with e4, leading to an imposing central pawn duo for White. If White does not take the d5-pawn, Black may eventually play ...dxc4, when a White response of e4 again leads to the same pawn structure. In classical opening theory this imposing pawn centre was held to give White a large advantage, but the hypermodern school, which was coming to the fore in the 1920s, held that a large pawn centre could be a liability rather than an asset. The Grünfeld is therefore a key hypermodern opening, showing in stark terms how a large pawn centre can either be a powerful battering ram or a target for attack. The first instance of this opening is in an 1855 game by Moheschunder Bannerjee, an Indian player who had transitioned from Indian chess rules, playing Black against John Cochrane in Calcutta, in May 1855:   and White mates in three (19.Nh6+ double check Kh8 20.Qg8+ Rxg8 21.Nf7). Cochrane published a book reporting his games with Moheshchunder and other Indians in 1864. It gained popularity after Ernst Grünfeld introduced it into international play at Vienna 1922, where, in his first game with the defense, he defeated future world champion Alexander Alekhine. Grünfeld usually employed a very classical style. The defence was later adopted by a number of prominent players, including Vasily Smyslov, Viktor Korchnoi, Leonid Stein, and Bobby Fischer. Garry Kasparov often used the defence, including in his World Championship matches against Anatoly Karpov in 1986, 1987 and 1990, and Vladimir Kramnik in 2000. Currently active notable players who employ the opening include Maxime Vachier-Lagrave, Loek van Wely, Peter Svidler, Peter Leko, Viswanathan Anand, Luke McShane and Gata Kamsky. Anand employed it twice in the World Chess Championship 2010. In the World Chess Championship 2012 between Anand and Boris Gelfand, each player used the Grünfeld once with both games ending in draws. Anand faced the Grünfeld against Magnus Carlsen during the first game of the World Chess Championship 2014 and drew in a Rook and Queen ending.