An article from Scientific American tell us:
“In a recent study by psychologists Colin Camerer and Tetsuro Matsuzawa, chimps and humans played a strategy game – and unexpectedly, the chimps outplayed the humans.”
(…)
“In Camerer’s experiment, it turned out that chimps played a near-ideal game, as their choices leaned closer to game theory equilibrium. Whereas, when humans played, their choices drifted farther off from theoretical predictions. Since the game is a test of how much the players recall of their opponent’s choice history, and how cleverly they maneuver by following choice patterns, the results suggest that chimps may have a superior memory and strategy, which help them perform better in a competition, than humans.”
The original paper is here.