Space

                                      
The more space you dominate, the less space for the opponent in which to move his pieces about, the more restricted the number of moves with which he may threaten you or guard himself against your threats.





 
What space does is: It allows your pieces to maneuver more easier and in a more free of fashion.
If you can place your pieces where you want to, instead of where you have to, then you
have a better chance of winning the game and having success.
– Bernard Baker
       
         

If you have less space – exchange pieces When you have less space, exchange some pieces. – Jeremy Silman, How to Reassess Your Chess   …the side with less space should initiate exchanges so that he will have more room to move about in. – Jeremy Silman, How to Reassess Your Chess   If you have more space – avoid exchanges If you have more territory, trade as few pieces as possible. – Jeremy Silman, How to Reassess Your Chess   The side with more space should avoid exchanges.  – Jeremy Silman, How to Reassess Your Chess   …unless it leads to some particularly favorable situation. – Jeremy Silman, How to Reassess Your Chess