[Shandrax]

Well, of course player A has the advantage. Player B has to decide below which number he will always draw and above which number he will always stand. Let's say just as an example, he always draws < 0.25 and always stands > 0.75 and inbetween it depends on what A does.

A on the other side has to bluff a certain amount of times. Overall it's this all about the Nash equilibrum and very complicated. No idea how you calculate this.