Vertical Wire reports that the "heated" match was played on authentic, 1960's-era equipment. After dispatching the mayor 2-nil, Baer gave the keynote address to open the conference, which was designed to promote the Netherlands as a European gaming hub.
Among those presenting at NLGD are serious games guru Ben Sawyer and Spore design team member Chaim Gingold.
UPDATE: A reader, Rob F, writes in to advise that we've got an error in this story regarding the origins of Pong:
[I] just wanted to point out that Ralph Baer did not create Pong, Nolan Bushnell/Al Alcorn did. Also, Pong was released in the 70s, so I'm unsure what 60s era equipment they were playing on, maybe Baer's Brown Box? Think was also from the 70s, maybe late 60s. Bushnell viewed Baer's Table Tennis on the Odyssey (the first home console) and basically ripped Baer off. I'm not a big fan of wikipedia, but from what I scanned they got it right.
Ralph wrote a book a couple years ago, it's really good. You can view a sample here.