Chennai: Indian IM Vaibhav Suri shared the lead with three others, including top seed Aleksei Aleksandrov of Belaurus, after the sixth round of the SDAT-RMK 4th Chennai Open International Grandmasters Chess Tournament on Saturday.
Ukraine`s Mikhailo Oleiksenko and untitled Chinese Yu Ruiyan were the other two chess players who shared the lead with 5.5 points here.
With 11 other players sharing the second spot with five points each, Delhi boy Vaibhav Suri scored a fluent win over Indian IM Vishnu Prasanna to jump into the top spot.
Vaibhav handled the white side of a Ruy Lopez Breyer variation in text book style. Vishnu tried the thematic break in the center on the 16th move but Vaibhav cleverly won a pawn and latched on to it.
Vaibhav then penetrated into the Black`s back rank with his rook and combined an attack with his Queen and Bishop to force Vishnu`s resignation in 46 moves.
The top seed Grandmaster Aleksei handled the Black side of a Nimzo Indian game against young Uzbek International Master Vakhidov Jahongir.
Aleksandrov`s forceful queenside play gave him a lasting initiative. In order to counter the queenside play, Vakhidov tried a desparate attack on the Black King which was easily negotiated by the Russian Grandmaster.
When further resistance proved futile, Vakhidov threw in the towel in 44 moves.
In the lone upset result of the day, Indian IM Debashish Das conquered Filipino Grandmaster Richard Bitoon in a Queens Gambit variation.
Richard went in for an erroneous combination which saw him lose a piece in the end and had to resign in just 25 moves.
International Master Ponnusamy Konguvel scored over higher rated MS Thej Kumar of Mysore to move into the second position with five points.
Five more rounds remain in this 11-round chess tournament.