Career
He made his money with the Volmac Software Group. From 1992 to 2011 he staged the annual Melody Amber chess tournament in Monaco, where world-class Grandmasters played rapid and blindfold games. Van Oosterom was a strong correspondence chess player, but suffered a severe stroke some years ago.
Earlier, van Oosterom had had two Dutch International Masters on his payroll whose job was to analyse his correspondence games.