India, Jan. 20 -- Wijk Aan Zee, The Netherlands: Viswanathan Anand pushed Magnus Carlsen to the wall before allowing the reigning world champion to walk away with a draw in the seventh round of Tata Steel Masters, here on Saturday. It was a Sicilian Rossolimo and Carlsen admitted that he missed out a crucial sequence of moves while sacrificing a pawn in the middle game. Anand, as white, had simply an extra pawn and this is where the tenacity of Carlsen came to fore. The world champion had to work hard in a much worse position but it never quite got out of hand as the game progressed. With six rounds still remaining, Anand is now joint fifth with Carlsen and three others at just passed the half way stage. The Indian ace still needs some catching up to do but he looks in fine fettle. In the challengers' section, Nihal Sarin scored a victory over Dinara Saduakassova of Kazakhstan....