Former world champion Viswanathan Anand continued to struggle against nemesis Magnus Carlsen of Norway and lost after a blunder in the fourth round of Grenke Chess Classic now underway here.
The loss with white pieces proved quite costly for Anand as he slipped to joint sixth in the standings in the eight-player round robin tournament.
he Indian will now be under pressure to score in the remaining three games to come back to a par score. Riding high on his success against Carlsen in round three, Arkadij Naiditsch of Germany emerged as the sole leader defeating compatriot David Baramidze.
Naiditsch took his tally to three points out of four and is now trailed by Carlsen and Fabiano Caruana of Italy on 2.5 points apiece.
About three weeks before Carlsen played the Dutch defense as black and lost to Anand's long-time second Radoslav Wojtazek of Poland in the Tata Steel tournament.
While that was the Leningrad variation, the world champion decided to try out the Stonewall set-up this time to ensure a lively game.
Michael Adams of England played out a draw with Caruana in the third round Etienne Bacrot of France who signed peace with Levon Aronian of Armenia.
Anand and Aronian are sharing the sixth spot on 1.5 points.Results (Round 4): V Anand (Ind) 1.5 lost to Magnus Carlsen (Nor) 2.5; David Baramidze (Ger) 1 lost to Arkadij Naiditsch (Ger) 3; Etienne Bacrot (Fra) 2 drew with Levon Aronian (Arm) 1.5; Fabiano Caruana (Ita) 2.5 drew with Michael Adams (Eng) 2.
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