I've got small problem with math and football.
We have 8 players, each pair of players played a one game ( 2 possibilites: one win (2 points) and the other one loose (0 point), or draw ( both get 1 point)).
After all, each player had the same number of points.
What is the smallest number of matches that end in a draw? why?

I need Your help.
Have a nice day.