Career
He played for Yugoslavia in three chess Olympiads (1950, 1952, 1954), winning a total of five medals. Rabar was a co-inventor of the classification systems for the Chess Informant publications. In December 1941, he played at second board against Ludovit Potuček (15: 05) in a match Croatia – Slovakia in Zagreb.
He represented the Independent State of Croatia there.
In 1949/50, he tied for 2nd-3rd, in Lucerne. In 1953, he took 3rd in Opatija.
In 1953, he tied for 1st with Vasja Pirc in Zagreb (12th YUG-ch), and afterwards lost a play-off match for the title. In 1954, he tied for 2nd-3rd with January Hein Donner, behind Wolfgang Unzicker, in Munich (zonal).
Rabar participated at the 1st Balkaniad in Belgrade in 1946.
Rabar played in three Chess Olympiads. In August 1952, he played at second board at the 10th Chess Olympiad in Helsinki (+5 –1 =6). In September 1954, he played at fourth board at the 11th Chess Olympiad in Amsterdam (+1 –3 =4).
Rabar was awarded the International Master (IM) title in 1950.
He coedited the monthly chess magazine Šahovski Glasnik. He is best remembered for designing the Opening Classification System that was used in the Chess Informant series of publications, which are the best-selling and most popular chess books of all time.