Viswanathan Anand scored a crushing victory over Alexei Shirov of Spain in the 10th round to maintain his position at the top in the 73rd Tata Steel Chess Tournament here.
Anand's victory came about the same time when American Hikaru Nakamura beat Maxime Vachier-Lagrave and the two maintained their co-leader status moving to an identical seven points out of a possible 10.
In another major surprise, world No. 1 Magnus Carlsen suffered his second defeat with white pieces bowing to Russia champion Ian Nepomniachtchi in a hard-fought game.
The other two overnight leaders - Vladimir Kramnik of Russia and Levon Aronian of Armenia played out draws with Dutch duo of Jan Smeets and Anish Giri respectively to remain a half point behind the two leaders. Carlsen shares the fifth spot with Vachier-Lagrave and Nepomniachtchi on 5.5 points and will now need a miracle to find himself in the leading group. Anand faced the Slav defense against Shirov.
Shirov was off-form here and this game as the Spaniard missed some fine prints and landed himself in trouble.