ilt ▁Club ▁( the ▁prede cess or ) ▁P rec ision ▁Club ▁ ▁Blue ▁Club ▁In ▁Small ▁club ▁systems , ▁the ▁opening ▁bid ▁of ▁ 1 ▁is ▁forcing ▁but ▁not ▁necessarily ▁strong . ▁It ▁typically ▁includes ▁some ▁range ▁of ▁bal anced ▁hands , ▁some ▁hands ▁with ▁long ▁club ▁suit , ▁and ▁very ▁strong ▁hands . ▁Ex amples ▁are : ▁Vienna ▁Club ▁( the ▁prede cess or ) ▁Roman ▁Club , ▁developed ▁and ▁used ▁by ▁famous ▁Blue ▁Team ▁Polish ▁Club , ▁origin ating ▁( and ▁standard ) ▁in ▁Poland ▁but ▁also ▁gained ▁certain ▁popular ity ▁world wide . ▁ ▁Dutch ▁double ton , ▁an ▁off spring ▁of ▁the ▁Polish ▁Club ▁system ▁SA Y C + , ▁Based ▁on ▁Standard ▁American ▁but ▁with ▁the ▁ 1 ▁forcing ▁and ▁including ▁all ▁ 2 1 + ▁hands ▁too . ▁ ▁Str ong ▁diam ond ▁systems ▁are ▁similar ▁to ▁strong ▁club ▁systems , ▁but ▁the ▁bid ▁of ▁ 1 ▁shows ▁a ▁strong ▁opening , ▁typically ▁ 1 6 + ▁and ▁the ▁bid ▁of ▁ 1 ▁is ▁typically ▁ne bul ous . ▁This ▁gives ▁more ▁room ▁over ▁the ▁ne bul ous ▁ 1 ▁opening ▁compared ▁to ▁the ▁strong ▁club ' s ▁ne bul ous ▁ 1 ▁opening . ▁ ▁There ▁are ▁several ▁examples ▁listed ▁here ▁www . strong d iam ond . co . uk . ▁Str ong ▁pass ▁systems ▁are ▁based ▁on ▁the ▁idea ▁that ▁ 8 - 1 2 ▁H CP ▁hands ▁are ▁the ▁most ▁frequent ▁( about ▁ 4 5 % ▁chance ▁to ▁hold ▁such ▁a