About Vladimir Simagin
Vladimir Simagin was a Russian chess grandmaster. He was three times Moscow champion, helped to train Vasily Smyslov to the World Championship, and made many significant contributions to chess openings. He died of a heart attack while playing in the Kislovodsk tournament. Simagin's first important high-class result was second place in the 1946 Moscow Championship, with 11/15, behind winner David Bronstein. In the 1947 Moscow Championship, he tied for top place with Bronstein and Georgy Rivinsky, with 9/14, and then won the playoff match-tournament. Also in 1947, he tied for 1st-2nd with Semyon Furman in the Championship of the Spartak Club, with 15/19, and also won that playoff match. It took him some time to qualify for his first Soviet final.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.