Unlike most presentation formats, a Sozi document is not organized as a slideshow, but rather as a poster where the content of your presentation can be freely laid out. Playing such a presentation consists in a series of translations, zooms and rotations that focus on the elements you want to show.

Par2 files create redundant data that can be used later in case parts of the original data is lost or corrupted.

Crafty is the strong chess program played on ICC. It uses all of the search algorithms you have probably read about and performs better than gnu-chess in most positions. It has a reasonable set of features to use, and offers a great starting point to try your own new search extensions.