Leonid Stein was one of the great Soviet chess grandmasters of the 1960s. The Ukranian won three USSSR Championships, and came up short in several attempts at becoming world champion. Several times, Stein qualified for the Candidates' Tournament (which used to determine the challenger for the championship) by placing high in various Interzonal tournaments, but as a result of a rule allowing just three USSR players to take place in it, Stein came up just short. At the peak of his career, Stein died of a heart attack at the age of 38. Here is one of his best games (in my opinion), showcasing the strength of two connected passed pawns.