Sparbot attempts to play in a near-optimal way. It hides information by playing a proper balance of randomized mixed strategies for all strengths of hands. However, in doing so, it will not attempt to exploit your weaknesses. It will merely attempt to defend against all possible methods of attack.
Approximating Game-Theoretic Optimal Strategies for Full-scale Poker.
Darse Billings, Neil Burch, Aaron Davidson, Robert Holte, Jonathan Schaeffer, Terence Schauenberg, and Duane Szafron,
Proceedings of IJCAI-03, (Eighteenth International Joint Conference on Artificial Intelligence), 2003.
(Winner of the IJCAI / AAAI 2003 Distinguished Paper Award)
http://www.cs.ualberta.ca/~darse/Papers/IJCAI03.html