Second Position
Although the solution requires many moves, the winning technique here is quite straightforward.
Once again the result depends on who has the move. Here White has the move, but if it were Red
to play the position would be drawn. White's winning plan has three stages. First, White must
use the move to establish an advantage in time and force by crowning all his
pieces - this is achieved by a process known as changing the guard, whereby kings take
over the duty of holding the Red men to free up the White men currently doing this job. Secondly,
White must force an exchange of kings, which actually loses the move. Finally White must use
his advantage in time and force to bring about another exchange, thereby regaining
the move, before Red can crown and escape to the double corner.
Checker Animator courtesy of Hans L'Hoest
