Winnograd Schema Challenges would be a step further for these text captchas. They are asking you to identify an ambiguous pronoun in a statement. Examples: -

Winnograd Schema Challenges would be a step further for these text captchas. They are asking you to identify an ambiguous pronoun in a statement. Examples: - The man couldn't lift his son because he was so weak. Who was weak? - The firemen arrived after the police because they were coming from so far away. Who came from far away? - The drain is clogged with hair. It has to be [cleaned/removed]. What has to be [cleaned/removed]? They are crafted in such a way that there are two variants of the challenge every time. Ex: The man couldn't lift his son because he was so heavy. Who was heavy? I don't know if they are hard to generate automatically. They do require common sense to solve and it's still an open problem. https://en.wikipedia.org/wiki/Winograd_Schema_Challenge https://en.wikipedia.org/wiki/Winograd_Schema_Challenge