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Definition of narrow the field

If you are the type to raise preflop to 3bb, your iso-raise might be 3bb + 1bb per slider. In other words, to use our example above, 2 players have limped so if the button makes an iso-raise, he will make it 3bb + 2bb so he will raise to 5 big blind. He could have made it bigger if he was out of position. The advantage of the iso-raise is that it will narrow the field. The more players in the hand, the lower our equity will be. By making an iso-raise (bigger than a standard raise), either everyone folds and you win the blinds, or you end up (most of the time) one-on-one in position with the initiative (advantageous position).

The advantages of narrow (the field)