In a large measuring cup add the rum, pineapple, garlic, salt and pepper. In a zip loc bag, add the chicken. Pour the marinade into the bag. Make sure the chicken is covered in the marinade. Marinade for 2 hours or more. In a skillet add the olive oil. when hot take the chicken and place in the pan.Cook the chicken according to the thickness of the breast. Serve with rice and a green vegetable. Bon Appetit.