Answer:
My second is performed by my first, and it is thought a thief by the marks of my whole might be caught.
It is where kings, queens, knights and bishops go to war together.
Where can you add 2 to 11 and get 1?
Is always in front of you but cannot be seen?
Born in the past, but only lives in the present. Sometimes false, always personal.
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?