Roos comes from a French chess family. His father Michel Roos (1932–2002) won the French Chess Championship in 1964; this success was repeated by his brother Louis in 1977. His mother Jacqueline Roos (died 2016) was International Correspondence Chess Grandmaster (2000), his sister Céline (1953–2021) was a Woman International Master (WIM), his brothers Jean-Luc (born 1955) and Louis (born 1957) are International Masters (IM).[1]
In 2009, in Salzburg, he shared 2nd - 5th place in International Chess Tournament 24. Schwarzacher Open.[2] In 2011, in Baden-Baden he ranked 3rd in International Chess Tournament Sommer-Open.[3]
Roos played for France in the Chess Olympiads:[4]
He played for France in the World Youth U26 Team Chess Championship:[5]
- In 1981, at first board in the 3rd World Youth U26 Team Chess Championship in Graz (+2, =7, -2),
- In 1983, at first board in the 4th World Youth U26 Team Chess Championship in Chicago (+3, =1, -4).
Also, Roos seven times played for France in the Chess Mitropa Cup (1977-1979, 1984-1988) and in team competition won silver (1987) and bronze (1977) medals, but in individual competition won gold (1977) medal.[6]
In 1982, he was awarded the FIDE International Master (IM) title.
