Sergey Ivanovich Sevastyanov: Bridging the Cosmos and the Chessboard Sergey Ivanovich Sevastyanov (1935-2010) was a figure of remarkable duality – a pioneering Soviet cosmonaut, a meticulous engineer deeply involved in the design of iconic spacecraft like the Vostok and Soyuz, and an unexpectedly prominent chess administrator. His life’s trajectory reflects both the ambitious drive of the Soviet space program and the intellectual rigo…