Python-сообщество

class Team(models.Model):
    name = models.CharField(_('Name'), max_length=250) 
    ...

class Game(models.Model):
    team1 = models.ForeignKey(Team, related_name="%(class)s_related1")
    team2 = models.ForeignKey(Team, related_name="%(class)s_related2")
    ...

class Overtime(models.Model):
    team1 = models.IntegerField(_('Overtime team 1'), default=0)
    team2 = models.IntegerField(_('Overtime team 2'), default=0)
    game = models.ForeignKey(Game)
    ...

class OvertimeInline(admin.TabularInline):
    model = Overtime

class GameAdmin(admin.ModelAdmin):
    ...
    inlines = [OvertimeInline]

    ...