In a small bowl, combine soy sauce, syrup and sugar, stirring well. Put chicken in a ziploc bag or freezer container and pour sauce over top. Refrigerate for about 1 hr, turning every 15-20 minutes.
Place container or bag in freezer.
On serving day
Thaw chicken in refrigerator over night.
Remove chicken from marinade and barbeque on the grill, or cook in the oven at 350F for 35-45 minutes (time will vary depending on chicken) until juices run clear and thermometer reads at chicken temperature setting.