Sergei Andreevich Yudin is a Russian chess grandmaster.
In December 2010, he tied for 1stâÂÂ4th with Semen Dvoirys, Pavel Smirnov and Sergei Iskusnyh at the Pavlodar Open.
In June 2014, he defeated several stronger grandmasters at the World Blitz Championship: Teimour Radjabov, Peter Svidler, and Hikaru Nakamura, ultimately finishing in 12th place despite being seeded only in 86th.
In March 2018, he won the Cup of Governor of Irkutsk OblastÃÂ with a score of 9/11, half a point ahead of runners-up Pavel Ponkratov and Igor Lysyj.
In January 2020, he finished as the second runner-up in the Chennai GM Open, behind winner Pavel Ponkratov and first runner-up José MartÃÂnez Alcántara.