Vasik Rajlich started developing Rybka in about 2003, and worked full-time on it since 2005. The appearance of the free Rybka 1 beta [4] and the first commercial version, Rybka 1 [5] end of 2005 was a sensation, and Rybka soon became the dominating program leading rating lists by a huge margin [6] [7] . Rybka 3 was developed in collaboration with Larry Kaufman, the most recent and strongest version Rybka 4 and the parallel version Deep Rybka 4 appeared in April 2010, market as standalone chess engine from RybkaChess.com [8] , from ChessOK optional with the Aquarium GUI [9] , or from ChessBase packaged with the Fritz GUI [10] . The demo version Rybka 2.3.2a can be downloaded for free [11] .
To read, replay and analyse the PGN games we adivse you to download the free PGN reader ChessBase Light. This program also gives you immediate access to the chess server Playchess.com.
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