This article outlines the factors that explain changes in the rules of the game in Chile after the restoration of democracy in 1990. It looks particularly at the reasons why the right-wing partiesstrong defenders of the constitution imposed by General Augusto Pinochet in 1980accepted reforms that eliminated many of what the literature has termed authoritarian enclaves. The article explains this shift by observing significant changes in the political context that, in turn, affected the priorities of veto players. In this context, short-term strategic calculations by the right-wing parties, aiming to achieve a new balance of power less detrimental to their interests, opened a window of opportunity that led to congressional approval of important reforms. Particular institutional features of the Chilean political systemparty discipline and a balance of power in favor of the executivealso helped the political actors to reach agreement.