Two person are competing side by side.
The small seal script of Compare is
Its clerical script is
It has meaning of "Compare" too.
Its current standard print script is
Its Pinyin is Bi2.
Let's see a similar character 从 （Follow, Post 73)
which is formed by two 人（Person, or People, Post 37), facing to left.
The character Game (比) is formed by two People, but just forcing to right.
It is not clear why two people facing to left is Follow (从), but facing right is Compete (比).