The Elegant Defense was created with Inform and has IFID 0C41DAC5-35D6-4986-9ADB-DEEA889A634B. To play a work like this one, you need an interpreter program: many are available, among them Gargoyle
for Mac OS X or Windows; Windows Frotz or Windows Glulxe for Windows.
Or you can play without downloading anything by following the 'Play In-Browser'
on your web browser.