▁the ▁other ▁describes ▁his ▁distribution ▁and ▁high ▁cards ▁in ▁detail ▁( rel ay ▁response ) ▁using ▁a ▁highly ▁cod ified ▁scheme . ▁Such ▁systems ▁are ▁out ▁of ▁the ▁above ▁classification ▁( based ▁on ▁opening ▁bid ▁structure ), ▁as ▁the ▁relay ▁feature ▁takes ▁place ▁later ▁in ▁the ▁au ction . ▁For ▁example , ▁relatively ▁popular ▁" M osc ito ▁system " ▁has ▁variants ▁based ▁on ▁strong - club ▁and ▁ ▁strong - pass ▁approaches . ▁Sym metric ▁relay ▁is ▁based ▁on ▁P rec ision ▁club . ▁ ▁Rel ay ▁systems ▁do ▁not ▁need ▁to ▁begin ▁with ▁an ▁initial ▁forcing ▁pass ▁or ▁an ▁initial ▁forcing ▁ 1 ▁opening . ▁ ▁The ▁AC BL ▁typically ▁dis all ows ▁relay ▁systems , ▁on ▁the ▁grounds ▁that ▁they ▁are ▁too ▁difficult ▁to ▁defend ▁against ▁without ▁a ▁lot ▁of ▁advance ▁prepar ation . ▁ ▁See ▁also ▁ ▁Bridge ▁convent ions ▁ ▁List ▁of ▁b idd ing ▁systems ▁ ▁Standard ▁American ▁ ▁Notes ▁ ▁External ▁links ▁List ▁of ▁b idd ing ▁systems ▁on ▁Bridge Gu ys ▁List ▁of ▁b idd ing ▁systems ▁on ▁Cla ire B ridge ▁A ▁classification ▁of ▁natural ▁b idd ing ▁systems ▁List ▁of ▁b idd ing ▁systems ▁in ▁' Full - dis closure ' ▁( B BO ▁compatible ) ▁format ▁ ▁* ▁ ▁fi : T ar j ous jär jest elm ä <0x0A> </s> ▁Christopher ▁James ▁" Chr is " ▁Turner ▁( 3 ▁April ▁ 1 9 5 1 ▁– ▁ 2 7 ▁April ▁ 2 0 1 5 ) ▁was ▁an ▁English ▁professional ▁footballer