Viktor Grünfeld is a notable figure in the world of chess, primarily recognized for his contributions as a chess player and theorist. He was born in 1909 in Vienna, Austria and later became known for the Grünfeld Defense, a popular opening strategy in chess. This defense is characterized by a counter-attacking approach, allowing Black to challenge White's center control. Grünfeld's chess career included participation in various international tournaments, where he showcased his skills against many prominent players of his time. His work in chess theory has influenced many players and remains relevant in modern chess strategies. He passed away in 1962, leaving a lasting legacy in the chess community.