A zany zigzag of puzzles and quizzes featuring The Scaffold
with special guest William Rushton
and Wendy Padbury, The Fourmost
Inspector Boniface Investigates
and the answer to:
The following represents a row of eight pennies arranged alternately heads and tails: THTHTHTH
The idea is to slide the coins about by pairs (a pair meaning two coins that are actually touching) until all the heads are on the left and all the tails are on the right. You must keep the coins in a straight line: HHHHTTTT
The pairs must not be twisted round or turned over in the process. The task can be done in as few as four moves. How?
(from Manchester)