What is the origin of the idiom "ghost of a chance" and when to use it?

The phrase "ghost of a chance" originated in the early 20th century and draws on the idea that a "ghost" represents something insubstantial or almost impossible to encounter. It is used to describe a situation where there is very little or no likelihood of success or victory. When someone or something has a "ghost of a chance," it implies that their chances are extremely slim, and they face significant obstacles in achieving their goals.