Locate the position of 20 chess knights in the grid...

Locate the position of 20 chess knights in the grid. The numbers in the grid indicate the number of knights attacking this cells. Knights are not on the numbered squares.

I wonder what the minimum number of values you would have to know is to be guaranteed a unique solution.

Fuck I wanted to try but you posted the solution :(
Now what's the point?

Fuck I wanted to try but you posted the solution :(
Now what's the point?

Fuck I wanted to try but you posted the solution :(
Now what's the point?

Fuck I wanted to try but you posted the solution :(
Now what's the point?

Fuck I wanted to try but you posted the solution :(
Now what's the point?

Fuck I wanted to try but you posted the solution :(
Now what's the point?

This is minesweeper you dingus

Fuck I wanted to try but you posted the solution :(
Now what's the point?