In poker, it determines aggression games to you as it steals can be much effective; the players must answer they with the games occasionally defensives with the hands that could not play to the contrary.

If, as an example, the player to your right steals frequently when you have sended the blind people, you can reasonably be sure that it is often making so as to with the inferior hands (was not making them the contrary therefore often), so as to you can probably defend your blind people (called or increase behind) with more hands that you could to the contrary.