Need negotiation tips, if I may? If I prove to Google that I am getting another better offer, how can I negotiate to make them eke out maximum salary? For ex

Need negotiation tips, if I may? If I prove to Google that I am getting another better offer, how can I negotiate to make them eke out maximum salary? For ex - Suppose I am getting USD $100k/ annum from Facebook, what is the maximum amount I can ask from Google and make them pay?