In the end of the 1990s, Tatiana Kaawar Ratcu was one of the leading Brazilian female chess players. She three times won the Brazilian Youth Chess Championships in the Girl's U16 age group (1992, 1993, 1994) and twice won Girl's U18 age group (1996, 1997). Also she twice won Brazilian Girl's Junior Chess Championships (1996, 1998). Tatiana Kaawar Ratcu five times won five times Brazilian Women's Chess Championships: 1994, 1995, 1996, 1997 and 2000. In 1995, Tatiana Kaawar Ratcu participated in Women's World Chess Championship Interzonal Tournament in Chişinău where ranked 43rd place. In 1998, in Rio de Janeiro she won the 1st World Junior Team Chess Championship with the Brazilian team.