€29.90
congratulations today, Harold, on your 60th.
Harold finished a PhD in 2009, while he was working at the research and development laboratory of the veterinary company Royal GD. After his PhD he became a full researcher and went on to lead a group of 20 technicians at the company.
But that is not what Harold is famous for. It is related to his hobby: chess studies, of which he has to date published around 150 (winning 28 prizes and many horourable mentions and commendations in the process).
But it is not even this for which he is famous. It is for collecting endgame studies and creating the largest collection in the world.