oren ▁taught , ▁with ▁ 1 3 ▁points . ▁ ▁Thus ▁we ▁effectively ▁use ▁the ▁same ▁high ▁card ▁point ▁scale ▁de vised ▁by ▁the ▁Four ▁A ces ▁in ▁the ▁ 1 9 3 0 s ▁with ▁A = 3 , ▁K = 2 , ▁Q = 1 , ▁J = ½ . ▁ ▁We ▁then ▁add ▁the ▁length ▁of ▁the ▁longest ▁suit ▁and ▁finally , ▁we ▁add ▁half ▁the ▁difference ▁in ▁the ▁length ▁of ▁the ▁second ▁and ▁fourth ▁longest ▁su its . ▁ ▁The ▁for ego ing ▁normal izes ▁Zar ▁Point s ▁to ▁numbers ▁more ▁commonly ▁used ▁in ▁Standard ▁American ▁b idd ing . ▁ ▁Alternatively , ▁see ▁the ▁section ▁below : ▁Ob tain ing ▁the ▁conversion . ▁ ▁To ▁get ▁the ▁H CP ▁equivalent ▁discussed ▁above , ▁Zar ▁points ▁need ▁to ▁be ▁scale d . ▁To ▁scale ▁the ▁values ▁of ▁the ▁hon ors ▁from ▁a ▁ 1 3 - point ▁scale ▁to ▁a ▁ 1 0 - point ▁scale , ▁the ▁Z P ▁are ▁multip lied ▁by ▁ 1 0 / 1 3 ▁and ▁rounded ▁to ▁the ▁nearest ▁half . ▁This ▁results ▁in ▁slightly ▁under ▁valu ing ▁a ces ▁and ▁j acks ▁but ▁is ▁much ▁more ▁accurate ▁than ▁the ▁traditional ▁count . ▁ ▁To ▁scale ▁the ▁shape ▁points ▁to ▁the ▁traditional ▁scale , ▁we ▁can ▁subtract ▁ 8 ▁( to ▁set ▁the ▁lowest ▁value ▁at ▁ 0 ) ▁and ▁divide ▁by ▁two ▁( to ▁scale ▁the ▁highest ▁value ▁correctly ). ▁Al gebra ically , ▁if ▁' a ' ▁is ▁the ▁length ▁of