A gentlemen's agreement
A sticking point
Play cards right
Stick to your guns
Drive a hard bargain
The upper hand
Go down the wire
To be good at negotiating; defend your position and get the best possible deal.
An agreement that is based on trust and that's not written.
To make the best and most effective use of the resources.
To be determined and continue with your plan or opinion.
To have more power than anyone else and as a result, to have the control.
A decision or agreement taken at the very last minute.
In a discussion, it is the point on which it is not possible to reach an agreement.