Career
In 1969, he tied for 1st–2nd with Miguel Cuéllar in Bogotá. De Greiff played for Colombia in nine Chess Olympiads. In 1954, at second board in 11th Chess Olympiad in Amsterdam (+8 –6 =4);
In 1956, at third board in 12th Chess Olympiad in Moscow (+7 –3 =9);
In 1958, at third board in 13th Chess Olympiad in Munich (+2 –2 =15);
In 1966, at third board in 17th Chess Olympiad in Havana (+4 –4 =8);
In 1970, at first reserve board in 19th Chess Olympiad in Siegen (+3 –4 =1);
In 1972, at fourth board in 20th Chess Olympiad in Skopje (+4 –4 =8);
In 1974, at first reserve board in 21st Chess Olympiad in Nice (+6 –0 =6);
In 1976, at first reserve board in 22nd Chess Olympiad in Haifa (+4 –0 =3);
In 1978, at first reserve board in 23rd Chess Olympiad in Buenos Aires (+0 –1 =2).
He died in Bogotá.