Arasan is a chess program that includes an opening "book" with over 600,000 moves.Arasan comes with a graphical user interface, but it can also be used together with Winboard, a separate interface program, as well as other interfaces that follow the Winboard or UCI standard. Oneexample is Arena Chess.Arasan's interface has on-line help if needed including setup and usage information for using Arasan with Windows user interfaces, such as Winboard.