However absorbed a commander may be in the elaboration of his own thoughts, it is sometimes necessary to take the enemy into account.

Winston Churchill
A snazzy little exercise when teaching about deception

A snazzy little exercise when teaching about deception

Always on the lookout for good challenges that will help students experience the disorientation of misfiring heuristics, I stumbled upon a new one, (courtesy of Mr Elliott, my daughter’s maths teacher.)  Here it is: