▁a ▁sal to , ▁which ▁may ▁range ▁in ▁difficulty ▁from ▁a ▁simple ▁single ▁t uck ▁to ▁a ▁triple ▁tw ist ▁layout . ▁The ▁Y urch en ko ▁gave ▁birth ▁to ▁a ▁new ▁v ault ▁group ▁called ▁" R ound ▁off ▁with ▁or ▁without ▁ 1 / 2 ▁to ▁ 1 / 1 ▁turn ▁( 1 8 0 - 3 6 0 ▁degrees ) ▁in ▁entry ▁phase ▁( Y urch en ko ▁entry ) ▁- ▁Sal to ▁forward ▁or ▁back ward ▁with ▁or ▁without ▁long ▁axis ▁turn ▁in ▁second ▁flight ▁phase . ▁ ▁Vari ations ▁ ▁Any ▁v ault ▁with ▁a ▁round off - back ▁hand spring ▁entry ▁is ▁class ified ▁as ▁a ▁" Y urch en ko - style " ▁v ault ▁in ▁the ▁Code ▁of ▁Point s . ▁Many ▁variations ▁of ▁the ▁original ▁v ault ▁have ▁been ▁introduced ▁by ▁g ymn asts ▁in ▁international ▁compet itions . ▁Even ▁as ▁of ▁ 2 0 0 6 , ▁g ymn asts ▁and ▁coach es ▁continue ▁to ▁develop ▁more ▁difficult ▁versions ▁of ▁the ▁Y urch en ko . ▁ ▁Back hand spring ▁entry ▁( off ▁the ▁table ): ▁ ▁D ung el ova : ▁Round off , ▁back ▁hand spring ▁entry ; ▁t uck ed ▁sal to ▁b wd ▁with ▁ 2 / 1 ▁turn ▁( 7 2 0 ° ) ▁off ▁▁ 1 ½ ▁tw isting ▁Y urch en ko : ▁Round off , ▁back ▁hand spring ▁entry ; ▁one ▁and ▁a ▁half ▁tw isting ▁layout . ▁Ab bre vi ated ▁as ▁ 1