Sadi Kalabar (18 February 1901 – 23 July 1960) was a Croatian origin Yugoslav chess player.
Sadi Kalabar played for Yugoslavia in the Chess Olympiad:[1] In this Chess Olympiad he made one of the most ridiculous blunder in the history of chess: in the game with the Argentine chess player Palau after moves 1. d4 Nf6 2. c4 e6 3.
Bd2 Sadi Kalabar wanted to play 4 ... Qe7, but instead of the queen he rearranged the king on the e7 square (4 ... Ke7) and after the answer 5.
Sadi Kalabar also participated in the Yugoslav Chess Championship in 1946 and shared 18th - 19th place (+4, =6, −9).
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