1. A method of determining an opening price for a product traded in a trading system, the method executed over a distributed network computer system, said method comprising: detecting a lock/cross condition in the market prior to opening; removing the lock/cross condition to allow opening of trading in the particular product, with removing further comprising: identifying the oldest of interest at the most aggressive price on each side of the market; selecting the older interest of the identified interest to designate as initial interest; and matching initial interest against all contra side interest.