THE EXAMPLE – An example to understand the mechanism is that of Chelsea. The blues (second) will not be able to challenge Juve (group opponent) nor City, Liverpool and United (English and all first). Only 4 possible left, and therefore the probability of crossing one of these increases considerably compared to others that have a wider range of possible rivals (Salzburg, for example, has 7). As mentioned, the intersection of all these possibilities gives life to the probabilistic calculus.