ChessBase offers a variety of "modular" chess playing programs (called "engines"
, but why would you need more than one chess engine? ChessCentral columnist Steve Lopez offers one reason (of many) in this article on the "Compare analysis" feature found in the Fritz and Rybka chess program interfaces.
The chess playing programs offered by ChessBase (Fritz, Rybka, Shredder, and Hiarcs) offer many features to help you improve your own chess play, but few are as (sadly) underutilized as the "Compare analysis" feature. This useful function allows multiple chess programs (called "chess engines"
to analyze your chess games...
Read more here: