cover system
... that the video game Gears of War revolutionized the cover system?
... that the video game <a href="./Gears_of_War" id="mwAr8" rel="mw:WikiLink" title="Gears of War">Gears of War</a> revolutionized the <b id="mwAsA"><a class="mw-redirect" href="./Cover_system_(gaming)" id="mwAsE" rel="mw:WikiLink" title="Cover system (gaming)">cover system</a></b>?