Let's try to put some numbers to that chance, and see how likely we are to get there.
We don't. We don't get there within the age of the universe, much less the age of the planet. If you're going to rely on chance, you have to accept what we know about the arithmetic of chance. Here, several shortcuts were made to make it work even at that pathetic level. In reality, those shortcuts would have knocked out the possibility of evolution entirely within the first time frame.
Keep in mind that Charles Darwin spoke as if chance was operating on undifferentiated live stuff, and producing that would be sufficient: but it's not sufficient for eyes and other sensory organs.
Some assembly required. End of story on undirected evolution.