Preheat Grill For High Heat. In A Bowl, Mix The Peanut Butter, Lime Juice, Soy Sauce, Garlic, Curry Powder, And Cayenne Pepper. Lightly Oil The Grill Grate. Place Chicken On Grate, And Brush With 1/2 The Sauce. Grill 6 To 8 Minutes. Turn Chicken, And Brush With Remaining Sauce. Continue Grilling 6 To 8 Minutes, Until Chicken Juices Run Clear.