disambiguation ) ▁ ▁I zz ard ▁( disambiguation ) <0x0A> </s> ▁A ▁knock out ▁s que e ze ▁is ▁a ▁s que e ze ▁in ▁three ▁su its , ▁one ▁of ▁which ▁is ▁the ▁tr ump ▁suit . ▁The ▁def ender ' s ▁tr ump ▁holding ▁is ▁needed ▁to ▁prevent ▁declar er ▁from ▁making ▁a ▁successful ▁play ▁involving ▁tr umps , ▁including ▁one ▁as ▁pro sa ic ▁as ▁r uff ing ▁a ▁los er . ▁Because ▁the ▁knock out ▁s que e ze ▁does ▁not ▁threaten ▁to ▁promote ▁declar er ' s ▁tr umps ▁to ▁w inners ▁( they ▁are ▁often ▁already ▁of ▁winning ▁rank ) ▁it ▁is ▁term ed ▁a ▁non - material ▁s que e ze . ▁Other ▁non - material ▁s que ez es ▁include ▁entry ▁s que ez es , ▁single - suit ▁s que ez es ▁and ▁w ink les . ▁ ▁Example ▁ 1 ▁ ▁In ▁a ▁sp ade ▁contract , ▁declar er ▁needs ▁three ▁of ▁the ▁last ▁five ▁tr icks . ▁He ▁can ' t ▁play ▁for ▁a ▁cross ru ff ▁because ▁East ▁will ▁get ▁the ▁lead ▁in ▁a ▁minor ▁suit ▁and ▁lead ▁his ▁ 8 . ▁Dec lar er ▁leads ▁dummy ' s ▁ 7 ▁and ▁East ' s ▁hand ▁col laps es . ▁ ▁The ▁sal ient ▁point ▁in ▁the ▁diagram ▁position ▁is ▁that ▁because ▁East ▁holds ▁a ▁tr ump , ▁South ▁can ' t ▁just ▁du ck ▁a ▁minor ▁suit ▁trick ▁to ▁set ▁up ▁a ▁cross ru ff . ▁If ▁he ▁does ,