In his attempt to think up a new game, Naismith was guided by three main thoughts. Firstly, he analyzed the most popular games of those times (rugby, lacrosse, soccer, football, hockey, and baseball); Naismith noticed the hazards of a ball and concluded that the big, soft soccer ball was safest. Secondly, he saw that most physical contacts occurred while running with the ball, dribbling, or hitting it, so he decided that passing was the only legal option. Finally, Naismith further reduced body contact by making the goal unguardable by placing it high above the player's heads with the plane of the goal's opening parallel to the floor. This placement forced the players to score goals by throwing a soft, lobbing shot like that which had proven effective in his old favorite game duck on a rock. Naismith christened this new game "Basket Ball" and put his thoughts together in 13 basic rules.