Stefano Roselli del Turco was a strong international chess player in the 1920’s and 1930’s.  He won the Italian Chess Championship in 1920, 1923, and 1931.  Even this strong chess master was not immune to bad games or blunders.

At the famous 1925 Baden-Baden tournament, he played a game against the legendary Efim Bogoljubow in which he was playing the black side of a Queen’s Gambit Declined.  On the 17th move he inexplicably played 17… Rf4??? and quickly resigned one move later.