From the early 1950s to the mid-1980s, Merete Haahr was one of the leading chess players in the Denmark. Eight times she won the Danish Women's Chess Championships: 1952, 1958, 1959, 1962, 1966, 1967, 1970 (after a play-off) and 1975. She sixth times participated in Women's World Chess Championship Zonal Tournaments: 1963,[1] 1966,[2] 1972,[3] 1975,[4] 1982[5] and 1987.[6]
Merete Haahr played for Denmark in the Women's Chess Olympiads:[7]
- In 1957, at second board in the 1st Chess Olympiad (women) in Emmen (+4, =1, -6),
- In 1969, at first board in the 4th Chess Olympiad (women) in Lublin (+3, =3, -5),
- In 1976, at second board in the 7th Chess Olympiad (women) in Haifa (+4, =3, -5),
- In 1978, at second board in the 8th Chess Olympiad (women) in Buenos Aires (+3, =7, -4),
- In 1980, at second board in the 9th Chess Olympiad (women) in Valletta (+4, =2, -4),
- In 1984, at first board in the 26th Chess Olympiad (women) in Thessaloniki (+2, =1, -8).
Merete Haahr played for Denmark in the Nordic Chess Cups:[8]
- In 1971, at sixth board in the 2nd Nordic Chess Cup in Großenbrode (+3, =1, -1) and won team silver medal,
- In 1972, at sixth board in the 3rd Nordic Chess Cup in Großenbrode (+2, =1, -1) and won team silver medal,
- In 1973, at fifth board in the 4th Nordic Chess Cup in Ribe (+1, =1, -3) and won team gold medal.
