The crucial difference between quantum mechanics and classic physics is Heisenberg's Uncertainty Principle (HUP). If the momentum of a particle is certain, then its location is accordingly uncertain, and the vice versa is true. For our purposes, the 'particles' in question will be the soccer ball, the players the referees, the coaches and the fans. The stadium, the field, the goal posts and the field markings will be the 'boundary conditions' necessary in solving the differential equations that describes the waves. So now lets place these guys, Heisenberg, Dirac, Pauli, Schrodinger etc on the field and lets watch what they will do!
The HUP says that if you are more certain about the ball's position, then you will be more uncertain about its momentum! When you are accurate about position, you miss the momentum! First understand well the 'direction' here. If you are standing directly away from the goal post, facing the goal, then the direction in question is along the goal, ie perpendicular to the direction you are facing. So the momentum in question is the one that take the ball along the goal, not across it, ie not towards the goal. So if you will try to get the right angle, in the hope of hitting the target, you will hit the ball with the wrong momentum, taking the ball to almost anywhere even all the way up to the corner of the field!
At any one time, the ball seems to be everywhere all at once! The ball seems to be at the goal, at the center, at the other goal and even amongst the fans! Same is the case with the players. A player seems to be running, sitting, getting subtiuted, getting injured, etc all at once! Playing Quantum football requires a competely different kind of skill! You can only increase the probability of being at a given region, but you can never be certain. Same is the case with your momentum, your energy etc. At any one time, you seem to be running at all the speeds and towards all directions!
Refereeing quantum football is also daunting! There is no way, for instance, of eliminating handball! At any one time, every player in the field seems to be handling the ball and commiting all the faults! So you can only define a certain probability that the players must not cross! We can only make the rule that 'you must not exceed a certain probability' that you will handle the ball. Same is the case with 'outside' or even 'goal'. At any one time, the ball is actually out of the field, with some probability. It is also at the goal! so the aim must not be to put the ball in the goal. Rather, it must be 'to increase the probability of the ball being in the goal to a certain threshold'. So it becomes 'goal' when one team reaches a certain threshold probability of finding the ball in the goal when observed!
This also brings another issue in quantum football! It must never be 'observed' by a classic player. This is because such an 'observation' will destroy its quantum nature. Nevertheless we can compromise a bit, adding some elements of classic world into this quantum soccer. The observeration can be done but only intermittently. So it is like observing the schrodinger cat briefly and then closing the box to recreate the quantum scenario. In this way, the game will be truely quantum. To 'observe the game', you will keep 'opening the box' and 'closing' it, and taking note of the positions of the players. You can now combine the pictures to create a classic movie. You will find that it is nothing like the classic soccer! The major difference being the unpredictability. But the team who will win will not be the one which put most balls into the goal, but the one which kept exeeding a certain threshold probability! With such a team, most of the time, the wave function 'collapses' to find the ball at the goal. So there will be a wave like distribution of balls. The winner will be determined by the 'density of balls' in the opponent's goal as compared with the similar 'density' in their own goal! So in quantum soccer, there will typically be myriads of goals, not just 2 or 3 like in the usual classic soccer.
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