from a quick glance around the lecture hall during class:
1 person is playing chess
i see at least 2 people doing computer science homework
surprisingly only 1 person shopping - i expected more
at least 5 people randomly scrolling through the lecture slides
1 person who is asleep
1 person with a black computer screen staring into space
more people than usual are on task today! but clearly i am not :P
probably chess.com/online chess which could potentially be against a real opponent or a bot.