An intense battle in Game 4 of the World Chess Championship between current world champion Magnus Carlsen of Norway and challenger Viswanathan Anand of India is underway in the Russian Black Sea resort of Sochi. Anand who is playing with black pieces in Game 4, is aiming at his sixth world title. Anand had drawn a marathon opener on Saturday, but went down in the second game. He drew level winning the third game yesterday. Both players are now level with 1.5 points apiece. The World Championship consists of 12 games and if necessary tie-break games as well.