Tries to categorize partner into one of four groups: Cooperator, Defector, Suspicious Tit for Tat (a variant of Tit for Tat where strategy starts off defecting instead of cooperating) or Random. Then bases decisions on trying to elicit mutual cooperation, but will defect on uncooperative partners.

In the past six rounds:	Categorize partner as:	In next move:
Partner cooperated every time	Cooperator	Cooperate
Partner defected more than 4 times	Defector	Defect
Partner defected 3 times	Suspicious Tit for Tat	If in the past two turns, partner defected, then defect. Otherwise, cooperate.
Partner defected less than 3 times	Random	Defect