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Szidonia Vajda

Full name Lázárné Vajda Szidónia
Country Hungary
Born 20 January 1979
Odorheiu Secuiesc, Romania
Title International Master
Woman Grandmaster
Peak rating 2418 (January 2008)

Szidónia Lázárné Vajda (née Vajda; born 20 January 1979) is a Romanian-Hungarian chess player with the FIDE titles of International Master (IM) and Woman Grandmaster (WGM). She won the women's Hungarian Chess Championship in 2004 and 2015.

In 1995 she won the Under-16 girls' section of the European Youth Chess Championship.

She played in the bronze medal-winning Romanian team in the 3rd Women's European Team Chess Championship in Batumi 1999 and played for Hungary in the Women's Chess Olympiads of 2002, 2004, 2006 and 2008.

In 2009 she won the 1st Teller Ede Memorial in Paks.

She is the sister of GM Levente Vajda.