Career
Udovčić gained the title of International Master in 1950 and became a Grandmaster in 1962. Chessmetrics gives his highest rating as 2618 in January 1953, which places him 39th in the world at that time. As well as being a top chess player, Udovčić worked as a judge.
He played on the fifth board, scoring 5 points from 7 games.
Udovčić also played for Yugoslavia in two European Team Chess Championships, scoring 7/10 in Oberhausen in 1961 and 6/9 in Hamburg in 1965. Yugoslav Championship 1963 (Zenica): 1st= 15/21 (with Ivkov)
Larsen, B–Udovčić, Sarajevo 1960
Bird"s Opening (Ecology F03)
1.f4 d5 2.Nf3 Nf6 3.e3 g6 4.b4 Bg7 5.Bb2 O-O 6.Be2 Bg4 7.O-O Nbd7 8.Na3 c6 9.c4 e6 10.h3 Bxf3 11.Bxf3 Qe7 12.b5 Ne4 13.Bxg7 Kxg7 14.bxc6 bxc6 15.cxd5 cxd5 16.Nb5 Qb4 17.Rb1 Qxd2 18.Bxe4 Qxe3+ 19.Kh1 Qxe4 20.Nd6 Qe3 21.Rb7 Nf6 22.f5 Qe5 23.fxg6 hxg6 24.Qf3 Rad8 25.Nb5 a6 26.Na7 Rd7 27.Nc6 Qf5 28.Qe2 Rxb7 29.Rxf5 exf5 30.Qxa6 Rb1+ 31.Kh2 Re8 32.Qa7 f4 33.Ne7 Ng4+ 0-1
Larsen resigned as 34. hxg4 was forced, which would have been followed by 34.
. Rh8 checkmate.