Product rule wins a competitive game

Abstract

We consider a game that can be viewed as a random graph process. The game has two players and begins with the empty graph on vertex set [n]. During each turn a pair of random edges is generated and one of the players chooses one of these edges to be an edge in the graph. Thus the players guide the evolution of the graph as the game is played. One player controls the even rounds with the goal of creating a so-called giant component as quickly as possible. The other player controls the odd rounds and has the goal of keeping the giant from forming for as long as possible. We show that the product rule is an asymptotically optimal strategy for both players. © 2007 American Mathematical Society.