>I'm involved in teaching chess to kids in elementary schools and I often play simuls there because the kids love it, since it's their only real chance to beat me. In one school there were these two very cute twin girls who arranged to sit beside each other. They were identical twins and I was never able to tell them apart! At the 1st board one played Black and at the 2nd board the other twin played White.
>As I made my move with White, the other twin played exactly my move on her board and this continued on and on. I was puzzled at how good they were playing and wondered why they were giggling all the time. It's because in effect I was playing both games against myself. Then I figured out what was going on.
>It took me a couple of moves to figure out how to deal with this. The next time around the room, I bypassed the 1st board and went to the 2nd board to insist that she move. When she did, I returned to the 1st board to make a different move, thereby ensuring that both boards were different. In this way, I managed to win both games.
>However, the lesson is: Beware of cute twin girls. They can be tricky!