A prisoner is enclosed inside a square. You are given 4 dogs that can roam the perimeter of the square. They run 1.5 times the speed of the prisoner. He escapes if he can cross the border without two or more of the dogs converging on him. Your challange is to pick an initial placement for the prisoner and the dogs and to program the dogs to keep him inside. You can give each dog a unique program, if you like. Communicated by friend Sam Yagan via friend Chris Coyne.