Chess Viewer Deluxe is the most full-featured and powerful Java chess viewer on the internet. It is the default chess viewer for Chessgames.com.

In order to use it, you will need to have the java installed on your computer. If you cannot see a board diagram like the one above (e.g., a red "X" appears instead) you will need to download Java from www.java.com. If you think that there is something wrong with your java installation you can test it at www.javatester.org.

The simplest way to view a game is to use the left and right arrow keys on your keyboard to step forward and backward through the game. You may also use the Autoplay button for hands-free viewing (see below).

Commences Autoplay so that the pieces move automatically every few seconds.
Refreshes the game, e.g. if you have moved pieces on the board for analysis.
Jump to the beginning of the game.
Move back one move. (same as left-arrow on your keyboard)
Move forward one move. (same as right-arrow on your keyboard)
Jump to the end of the game.

More information is available at the official website.
You may also contact the author Nikolai Pilafov at his Chessgames.com Chessforum.