In 1992 in Antwerp Mónica Calzetta Ruiz taken the 4th place in the World Women's Student Chess Championship. In 1995 in Chisinau she participated in the Women's World Chess Championship cycle Interzonal Tournament. Mónica Calzetta Ruiz participated in Women's World Chess Championship 2000 knock-out tournament in New Delhi and lost Corina Peptan in the 1st round. In 2008 taken 4th place in the international chess tournament "Chambery Masters" and to fulfill her first men's International Master (IM) norm.