Gustaaf Josephus Nietvelt (30-11-1897 - 15-11-1961) Belgian chess composer

Gustaaf Nietvelt was the founder of the Belgian magazine "De Problemist" (1927-1931) which later merged with "Het Schaakleven". He mostly composed twomovers. His name was given to a black defense. "Nietvelt defence: A black unit selfpins itself because the threat must unpin it by withdrawal. The selfpinning must be used thereafter."

Source: chesscomposers.blogspot.com