The phrase "opening gambit" refers to the first strategic move or action taken by someone at the beginning of a game, discussion, or negotiation, usually intended to gain an advantage or set the tone for what follows. Full definition
The offer, believed to be in the region of # 60million, comes 24 hours after the Gunners rejected City's opening gambit of # 50million. (mirror.co.uk)
«OF COURSE I'm all in favour of clean energy, especially wind power, but...» That is a familiar opening gambit in a new sort of political storm, raging ever more fiercely in corners of the world where electric power comes, or may soon come, from flashing blades rather than blazing furnaces. (economist.com)
It may not be the most conventional opening gambit for a group test, but I'm going to front up with a confession. (evo.co.uk)