Derren Brown at Chess

[Alan Jelfs]

The copying gag couldn't be used seriously to get one point out of two games if clocks were being used, as the copiers could be made to run out of time

eg say, 3 secs delay per move = 2 minutes difference on the clocks near the end of the 40 moves so the copiers would at some point have to move first or lose on time. Once they broke with the copying they'd have less time left than the copyees.

But with, say, 30 second increments they would always have enough time to make their moves.