Rybka is a program for Windows that provides a standalone UCI chess engine designed for playing and analyzing games. Basically, it suggests moves and gives you evaluation scores for various positions. For optimal use, it has a graphical interface which facilitates interaction.

Position analysis

There are two powerful analysis methods, namely Infinite Analysis and IDeA. The first is enriched with distinctive features, like the Infinite Analysis History. If you suspect that you might have analyzed an interesting position a couple of months ago, you can quickly look it up.

IDeA represents an innovative analysis method. It examines a position, automatically navigating through the most crucial moves to generate a tree of variations. The crawling process goes on until you choose to stop it. If you would like to play against an AI opponent, you may try software like Chessimo.

Annotate your games

The application offers a diverse set of options for annotating games and chess trees. You can employ Chess Informant style symbols, record verbal commentaries, apply board graphics, and more. It is possible to incorporate reference games from a database and endgame information from tablebases. The annotations are saved, enabling you to see them when the same position comes up.

Features

free to download and use;
compatible with modern Windows versions;
allows you to analyze and annotate chess games;
you can insert reference matches from a database;
there is an option to record verbal commentary.