Playing with white pieces, GM Gupta enjoyed a certain advantage in the middle game that ensued and even got one opportunity when the whole point was up for grabs.
However, the Indian missed and Idani, himself a former U-18 World Champion, did not give Gupta a second chance to create an opening.
Up against higher opposition, the Indians had a mediocre day in the third round.
Sergei Zhigalko from Belarus also made most of his white pieces like Fedoseev as he scored over talented Indian GM Murali Karthikeyan while the big winners of previous round - Abhishek Kelkar and NR Vignesh went down fighting against Papp Gabor of Hungary and Mikheil Mchedlishvili of Georgia respectively.
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Looking for his second GM norm, Sagar Shah also ended on the receiving end against Nils Grandelius of Sweden.
There are no Indians in the leading pack currently and the likes of Gupta, Grover and Karthikeyan will have to do the hard catch-up job in the next few rounds.
LN Ram Arvind produced the upset of the round when he put it across GM Sergei Beshukov of Russia. Arvind's second victory in the tournament took him to two points from his three games thus far.
The next round will also see some tough clashes for the Indians in the fray here. Gupta is set to meet an experienced Alexander Shabalov of United States while Grover too has a tough opponent in compatriot Mehar Chenna Reddy.