 Complete the following phrase:  Previously known as the Lasker-Pelikan variation of the Sicilian Defence, Sveshnikovs system was considered of dubious merit until he transformed it into an exciting and fully playable opening. The balance between winning and losing is often on a knife edge, making it an attractive proposition for black players seeking the full point. Mark Taimanov, in an interview, described it as chess opening theorys last great discovery. That it is now regularly played by the worlds leading grandmasters lends credence to this view. Vladimir Kramnik and Valery Salov are regarded as expert practitioners of the Sicilian Sveshnikov categorised by the moves 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 - the Sveshnikov proper continuing 6.Ndb5 d6, but Kasparov, Shirov, Leko and Khalifman have also enjoyed success with it. Moreover, Magnus Carlsen employed this opening several times during the 