I recall a discussion thread on here a couple years back regarding the "cooking out of the alcohol" in recipes that called for using it. It got into a very heated argument, apparently, not as much of it cooks out as previously thought. anyways...
food police tip... if you choose to marinate the chicken in the sauce prior to grilling as stated in the recipe as optional, I would certainly recommend boiling the marinated sauce prior to using it for basting the chicken. better yet... make more sauce than stated, reserve some aside for basting or dipping, and use the remainder for marinating... discard the marinade portion.