In 1954 and 1955, Etruk won the Estonian Junior chess championship.

Etruk played for Estonia in various Soviet Team Chess Championships.

[3] Etruk won nine medals in the Estonian Chess Championship: three gold (1965, 1969, 1973), three silver (1964, 1966, 1970) and three bronze (1962, 1967, 1968).

In 1971, Etruk finished sixth in the Pärnu tournament, which was won by Leonid Stein, ahead of Mikhail Tal, Paul Keres and David Bronstein.

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