challenge of something

The roblers* must challenge with either a hundred svu or twenty shares of Kotzash.

In most 'classic' SF it's the ideas that are challenging of course, rather than the writing.

He also challenged the suffering both of animals and of young children.

-do not, I beg you, challenge the power of this family.

In doing so, these historians challenged both the Soviet and the Western accounts of the revolution.

No one challenged him, of course; he was a Citizen.

The appointed or retained defense attorney may challenge both the military judge and members of the panel for cause.

Nobody challenged men openly, of course, but when women spoke now amongst themselves, there were whispers, and looks exchanged.

Although not challenging the upper realms of the Nguyễn system.

However, this bureaucratic system was exploited by the social elite whose increasing power challenged that of the Emperor.