From the end of 1950s to the mid-1970s Triantafyllos Siaperas was one of Greek leading chess players. He twice won Greek Chess Championship: in 1956, and 1972. In 1968, in Athens Triantafyllos Siaperas participated in World Chess Championship European Zonal Tournament where ranked in 16th place.[1]
Triantafyllos Siaperas played for Greece in the Chess Olympiads:[2]
- In 1956, at first board in the 12th Chess Olympiad in Moscow (+4, =3, -8),
- In 1968, at second board in the 18th Chess Olympiad in Lugano (+3, =5, -5),
- In 1970, at first board in the 19th Chess Olympiad in Siegen (+7, =4, -4),
- In 1972, at first board in the 20th Chess Olympiad in Skopje (+4, =3, -8).
Triantafyllos Siaperas played for Greece in the European Team Chess Championship preliminaries:[3]
- In 1973, at first board in the 5th European Team Chess Championship preliminaries (+0, =2, -1).
Triantafyllos Siaperas played for Greece in the Men's Chess Balkaniads:[4]
- In 1972, at first board in the 4th Men's Chess Balkaniad in Sofia (+1, =0, -3),
- In 1973, at first board in the 5th Men's Chess Balkaniad in Poiana Brașov (+0, =3, -0).
