Mexico City:Viswanathan Anand squandered a winning opportunity to settle for a draw in the fourth round against Alexander Morozevich in the World Chess Championships in Mexico.
Anand, with a draw in 57 moves, though stays in shared lead with Vladimir Kramnik, both having 2.5 points from four games.
Four players, including Moro, Alexander Grischuk, Boris Gelfand and Lev Aronian have two points. Peter Leko and Peter Svidler have 1.5 points each.
For the third day in a row Anand was in a featured game - considered to be one of the most original top class players.
Moro had just recovered from the second round loss to Kramnik and the outplayed Svidler in third.
The Moro-Anand game went into the fashionable Meran variation of the Slav defence. The duo played at a blitz-like speed along well-known lines.
Anand, showing good preparations, came up with a different new plan and Morozevich had to find how to react, as such positions could easily turn in Black's favour.
After a strong opening, Anand had a variety of options in middle game and consolidate some advantage. White was forced to win an exchange but a black pawn got to d3 and was supported by a powerful pair of bishops.
As the players began to play faster, Anand had decisive advantage but the question was whether he really needed to go for the knight sacrifice earlier. Yet at this stage after 40 moves, Anand's win looked only a matter of time.
Anand wanting to finish the game fast seemed to be going strong. Morozevich's king was in delicate situation and though the material was equal it was hard to find adequate moves.
The top seeded Indian after Moro's 56, Be6 looked very closed to a win but he slipped there and according to analysts it allowed Moro to back into the game. A few moves later Moro had warded off the threat and a draw was agreed after 61 moves.
Anand must have been disappointed as he had advantage throughout the game till he missed a chance towards the end in a completely winning position. Morozevich was stubbornly finding defensive resources and was rewarded by achieving to draw in this seemingly hopeless game.
In another game, Kramnik was held to a draw by Grischuk in 60 moves from a Catalan. Grischuk fought well and held out for a good draw.
Aronian handed Leko a solid defeat in 45 moves from English Symmetrical start and Svidler and Gelfand were engaged in a short 24-move draw from Petroff.