To redeem your certificates at Chess4Less.com go to their web site and pick out the items you want. Email chess4lessgmail.com with your name, certificate number(s) and the item(s) you want and he will get back to you.
To redeem at Rochester Chess Center check out in the normal manner but put the following in the comments field “National Open certificate number 2019-nnn-n $25” or “National Open certificate number 2019-nnn-1, 2018-nnn-2, $50”. You will only be charged the price difference if any.
Plus score certificates can only be used by the player who won them and will not be redeemed after July 15, 2019.