So I have some trouble understanding Oasis poor translation, now I have another question regarding chance.

What is:

- a chance

- a given chance

- a fixed chance

- a small chance

- a high chance

- a very high chance

- a certain chance

The last four are pretty obvious, but still, I want to ask the difference (especially the given chance one). What is the difference? I mean like how much the "rate" difference, or any other calculation?