Alibaba And Forty Thieves Plus

The thieves realize that someone must know the secret of their cave, therefore they try to move the treasure and run away.
Hurry up! Stop the thieves before they take the treasures away!

This is a casual game with very simple manipulation.
You need to encircle a thief in a certain area by clicking on a 9*9 grid. This is not so simple as its manipulation...

You, Ali Baba, the clever one, need to catch them with minimum steps.
How many steps do you need?

Let's get on with this never-ending battle of brainpower!