SUMMARY: This article offers reflections on the power relations between the executive and legislative branches of the Chilean state by examining the way political parties leveraged the electoral system to balance the weight of each branch in the configuration of government. The period from 1874 to 1924 is framed by a cycle of reforms to Chile’s 1833 constitution that were pushed through by liberal sectors to limit the power of the executive under the country’s presidential regime, efforts that contributed to a final breakdown of the presidential regime following civil war in 1891. That year the victorious revolutionary forces implemented a parliamentarian system that remained in place until it was overthrown by a military coup. The literature on this process has studied the use of legislative manoeuvres such as obstruction, accusation and filibuster by political parties to weaken the executive power. Little has been written, however, about the way parties exploited the rules and procedures of the electoral system and, specifically, the use of official complaints and the process known as calificación (qualification) by which congress audited final election results. This article will help fill that void, focusing on understanding how both practices worked and the effects that the election reforms of 1874, 1884 and 1890 had on them.