ChessBase is a chess database developed by Matthias Wüllenweber for the Atari ST which led to the foundation of the ChessBase company in 1986 along with Frederic Friedel - the product name eponym of the company. ChessBase 1.0 was first released in January 1987 for the Atari ST running under GEM. Mathias Feist ed ChessBase in the late 80s, and was responsible to port the database and interface from Atari ST into the x86 DOS/Windows world, and further integrated first chess engines into the ChessBase interface, turning this into Fritz in 1991.
ChessBase 3.0 (DOS version)
Subsequent ChessBase versions evolved to a sophisticated multiple purpose GUI for database management, database queries and mining, interactive multimedia and video tutorials, analyzing or playing games and automatic engine tournaments with various native, UCI or WinBoard compliant engines on a single computer, inside a network or cloud, online play via the Playchess chess server, and Web- and desktop publishing of chess related documents.
A chess database is an organized collection of hundreds, thousands, or nowadays even millions of chess games. The proprietary ChessBase format manages those games with indices and classifiers for data mining and fast access. Queries for games can consider a variety of items, such as player names, date of games, ECO code, thematic keys and fragments of positions. PGN is ed as interchange format.
The ChessBase 3 database format (CBF) used two kind of files, data (*.cbf) and indices (*.cbi). The move encoding was based on a deterministic move generator, storing the generation number of a move. Along with ChessBase 6 in 1996, a new format was established, dubbed CBH, which was able to handle nested variations with annotations, multimedia files, and more sophisticated indices. One CBH database consists of more than ten files with various extensions, which can be archived inside a single file (*.cbv) format. Apparently, the CBH file format was reverse engineered for interoperability purposes like import into other databases
This version of ChessBase 3.0 was designed for personal computers with operating system MS-DOS (Microsoft Disk Operating System), which was operating system developed by Microsoft in 1981. It was the most widely-used operating system in the first half of the 1990s. MS-DOS was supplied with most of the IBM computers that purchased a license from Microsoft. After 1995, it was pushed out by a graphically more advanced system - Windows and its development was ceased in 2000. At the time of its greatest fame, several thousand games designed specifically for computers with this system were created. Today, its development is no longer continue and for emulation the free DOSBox emulator is most often used. More information about MS-DOS operating system can be found here.
Available online emulators:
5 different online emulators are available for ChessBase 3.0. These emulators differ not only in the technology they use to emulate old games, but also in of various game controllers, multiplayer mode, mobile phone touchscreen, emulation speed, absence or presence of embedded ads and in many other parameters. For maximum gaming enjoyment, it's important to choose the right emulator, because on each PC and in different Internet browsers, the individual emulators behave differently. The basic features of each emulator available for this game ChessBase 3.0 are summarized in the following table:
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This version of ChessBase 3.0 was designed for personal computers with operating system MS-DOS (Microsoft Disk Operating System), which was operating system developed by Microsoft in 1981. It was the most widely-used operating system in the first half of the 1990s. MS-DOS was supplied with most of the IBM computers that purchased a license from Microsoft. After 1995, it was pushed out by a graphically more advanced system - Windows and its development was ceased in 2000. At the time of its greatest fame, several thousand games designed specifically for computers with this system were created. Today, its development is no longer continue and for emulation the free DOSBox emulator is most often used. More information about MS-DOS operating system can be found 
