The word zugzwang means a move in chess which forces your opponent to make a detrimental move; a move causing all of your opponent's options to be moves which will worsen their situation. Although it is definitely an English word, appearing in most English dictionaries, when I have tried to find out the origin of the word the only information I have found is that it is a German word meaning "compulsion to move".
Does anyone know how this word entered the English vernacular?