▁of ▁an ▁entry ▁and ▁a ▁threat ▁card ; ▁West ▁is ▁s que ez ed ▁as ▁South ▁r uff s ▁a ▁card ▁in ▁the ▁fourth ▁suit . ▁ ▁Example ▁ 3 ▁ ▁Disc uss ing ▁the ▁relationship ▁between ▁back w ash ▁and ▁knock out ▁s que ez es , ▁Ott lik ▁and ▁K else y ▁state , ▁" The ▁K O ▁[ k no ck out ] ▁s que e ze ▁is , ▁in ▁fact , ▁the ▁general ▁form ▁of ▁the ▁strateg ic ▁s que e ze ▁against ▁' id le ' ▁tr ump ▁cards , ▁of ▁which ▁the ▁back w ash ▁. ▁. ▁. ▁is ▁a ▁particular ▁case ." ▁▁ ▁The ▁back w ash ▁and ▁the ▁knock out ▁s que ez es ▁can ▁be ▁distinguished ▁by ▁whether ▁the ▁s que ez ed ▁def ender ▁must ▁play ▁before ▁or ▁after ▁third ▁hand ▁r uff s : ▁in ▁the ▁knock out ▁s que e ze , ▁the ▁s que ez ed ▁def ender ▁plays ▁prior ▁to ▁the ▁r uff ; ▁in ▁the ▁back w ash ▁s que e ze , ▁after . ▁The ▁following ▁example ▁is ▁from ▁K else y ▁and ▁Ott lik : ▁ ▁Again st ▁ 4 , ▁West ▁leads ▁a ▁small ▁tr ump . ▁The ▁defense ▁is ▁now ▁a ▁tempo ▁ahead , ▁if ▁South ▁plays ▁to ▁r uff ▁a ▁diam ond ▁in ▁dummy . ▁See ing ▁this , ▁South ▁wins ▁dummy ' s ▁ 8 , ▁takes ▁the ▁heart ▁fin esse , ▁and ▁c ash es ▁the ▁K , ▁the ▁A ,