What chances did enslaved African-Americans have of obtaining permanent freedom through revolt or escape?

Slaves had a little to nothing chance of escaping or revolting against their master. They will always be discriminated against, in which at that time could not have a say in that kind of situation. Even if they said they were free, they could win against the white people's words. Just like Solomon, he kept insisting that he was a free man in the state of New York and that he even has papers to prove it, but he was kidnapped to Georgia and Georgia was not a free state. Therefore, he involuntarily became a slave. Two white men earned Solomon's trust but only one of them did not let him down. The first man he trusted was named Armsby and he totally betrayed Solomon with little to no doubt in his mind, even after he swore he would not tell on his honor. Solomon requested him to deliver a letter to his family in New York in which he would write. Soon enough, Armsby told Mr. Epps who dragged Solomon from his sleep to ask about this situation. Solomon came up with a clever alibi by explaining to Mr. Epps that he would not be able to write with no ink or pen and that Armsby is a drunken man who does not know what he is saying. The second man who had Solomon's trust name is Bass. Bass was a man who was building a little house for Mr. Epps and he is a righteous person who thinks that slaves are just as equal as any other person. He actually got into a bit of an argument with Mr. Epps due to his belief that slaves are human beings too. But of course, Mr. Epps ferociously disagreed and called slaves baboons. Solomon requested that Bass would deliver a letter for him to New York and Bass hesitated but for someone's freedom he was willing to risk himself. In the end, Solomon had free papers thanks to Bass and was free from being a slave. 

Solomon and Bass