Exactly 39 years ago, the first yellow cards were handed out in the Dutch national league. Seven were booked at the start of the 1972/1973 season, but media still struggle to figure out who got the card first. Youngest Fifa referee at that moment, 31-year-old Jan Keizer from Volendam, announced one day before the tournament in De Telegraaf that ‘referees will hand out yellow cards much faster than they did before when referees just gave warnings’. They had to be more strict on ‘laying down an opponent’ and ‘not taking enough distance when you’re in the wall’. Keizer was happy with the new measures. “They are fantastic, because they’re of…