▁A col , ▁featuring ▁ 4 - card ▁maj ors ▁and ▁weak ▁not r ump , ▁origin ating ▁in ▁Great ▁Britain ▁Standard ▁American , ▁originally ▁with ▁ 4 - card ▁maj ors ▁but ▁later ▁adopt ing ▁ 5 - card ▁maj ors . ▁Str ong ▁not r ump . ▁Bridge ▁Base ▁Basic , ▁based ▁on ▁Standard ▁American ▁and ▁used ▁in ▁internet ▁play ▁ 2 / 1 ▁game ▁forcing , ▁based ▁on ▁Standard ▁American ▁and ▁gradually ▁su pers eding ▁it . ▁ ▁Some ▁features ▁of ▁ 2 / 1 ▁game ▁forcing ▁origin ated ▁from ▁the ▁Roth – St one ▁and ▁Kap lan – S hein w old ▁systems ▁of ▁the ▁ 1 9 5 0 s ▁and ▁ 1 9 6 0 s . ▁Vari ous ▁develop ments ▁in ▁the ▁area ▁of ▁natural ▁systems ▁have ▁resulted ▁in ▁systems ▁that ▁are ▁natural ▁in ▁ess ence , ▁but ▁contain ▁special ▁features . ▁Ex amples ▁are ▁systems ▁like ▁Rome x , ▁Bor ing ▁Club , ▁Fant unes , ▁and ▁E H AA ▁( Every ▁Hand ▁An ▁Advent ure ). ▁ ▁Art ific ial ▁systems ▁Art ific ial ▁systems ▁can ▁be ▁further ▁class ified ▁into : ▁Str ong ▁club ▁systems ▁are ▁the ▁most ▁popular ▁artificial ▁systems , ▁where ▁opening ▁of ▁ 1 ▁shows ▁a ▁strong ▁hand ▁( typ ically ▁ 1 6 + ▁H CP ). ▁Other ▁ 1 - level ▁b ids ▁are ▁typically ▁natural , ▁but ▁limited ▁to ▁about ▁ 1 5 ▁H CP . ▁The ▁most ▁popular ▁strong ▁club ▁systems ▁are : ▁V ander b