Sergei Andreevich Yudin is a Russian chess grandmaster.
In December 2010, he tied for 1st–4th with Semen Dvoirys, Pavel Smirnov and Sergei Iskusnyh at the Pavlodar Open.
[2] 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.
[3] In March 2018, he won the Cup of Governor of Irkutsk Oblast with a score of 9/11, half a point ahead of runners-up Pavel Ponkratov and Igor Lysyj.
[4] In January 2020, he finished as the second runner-up in the Chennai GM Open, behind winner Pavel Ponkratov and first runner-up José Martínez Alcántara.