Changes

'''DEF''' ({{Ruby|守|しゅ}}{{Ruby|備|び}}{{Ruby|力|りょく}} ''Shubiryoku'', lit. ''Defense Power'') are the points that determine a monster's '''defense''' or '''toughness''' when defending against your opponent's [[Monster Cards]]. DEF is short for '''defense'''.

If a monster attacks another with an [[ATK]] that is greater than the [[DEF]] of that monster, the [[Defense Position]] monster is [[destroy]]ed, but the [[control]]ler of the [[Defense Position]] monster takes no [[damageBattle Damage]] to his/her [[Life Points]], unless the attacking monster has an ability called a "[[piercing]]" [[effect]] where the difference between [[ATK]] and DEF is dealt as [[Battle Damage]].

If the same situation is reversed, where the [[ATK]] is lower than or equal to the opponent's monster's DEF, both monsters remain on the field, but the controller of the attacking monster loses [[Life Points]] takes Battle Damage equal to the difference between the [[ATK]] and [[DEF]] values.