Indian chess ace Viswanathan Anand will clash with World Champion Magnus Carlsen in the seventh game at Sochi, Russia on Monday. Anand lost the sixth game played on Saturday and is staring at a deficit of one point at the half way stage of the 12-game match. The Norwegian is now ahead with 3.5 points vs Anand's 2.5 points.Anand will have to chalk out a plan to neutralise the Norwegian's big advantage in very quick time. And that may not happen till the eighth game now as change in colours at halfway stage mean that Carlsen will again get white pieces in game seven to be played tomorrow.