Later he moved to the club "Böyökzehir Belediye" Istanbul, where the coach Ibrahim Yildirim supervised him.

However, the Turkish Wrestling Federation remained loyal to him and also nominated Hakkı for the 1992 Olympic Games, because it was recognized that there was a lot of potential in him.

He also defeated Koguashvili at the 1993 European Championships in Istanbul, but this time he failed to beat the Swedish surprise Jörgen Olsson, but still won the bronze medal in the light heavyweight division.

His main rival Gogi Koguashvili was eliminated even before the final, in which Hakkı safely beat Petru Sudureac from Romania.

After a 12th place at the European Championships, he still finished 5th at the Olympic Games in Atlanta in the light heavyweight category.

Nevertheless, Hakkı achieved great success in the spring of 1997, when he became European champion in Kouvola / Finland, where, however, some of the previous stars of the old weight classes were missing.

In autumn, it was only enough to finish 10th at the World Championships in Wroclaw, where for the first time all the cracks from the former weight classes were at the start.