Answer 1

Class Team{
Public Guid Id { get ; set ;}
Public string Name {get ; set ;}
Public virtual game Games {get ;set;}
Class Game {
Public Guid Id { get; set;}
Public int FirstTeamId {get; sent;}
Public int SecondTeamId {get;set;}
Public dateTime date {get;set;}
Public virtual team Teams {get;set;}

Answer 2

r f yeah, is another way to resolve problem, but u have to make sure that is gut for ur design