GNU General Public LicenseSeries of free software licenses
Computer chessComputer hardware and software capable of playing chess1990s pressure-sensory chess computer with LCD screenComputer chess includes both hardware (dedicated computers) and software capable of playing chess. Computer chess provides opportunities for players to practice even in the absence of human opponents, and also provides opportunities for analysis, entertainment and training.
Chess engineIn computer chess, a chess engine is a computer program that analyzes chess or chess variant positions, and generates a move or list of moves that it regards as strongest. A chess engine is usually a back end with a command-line interface with no graphics or windowing. Engines are usually used with a front end, a windowed graphical user interface such as Chessbase or WinBoard that the user can interact with via a keyboard, mouse or touchscreen.
Command-line interfaceA command-line interface (CLI), also known as a command-line shell, is a means of interacting with software via commands – each formatted as a line of text. The concept of interacting with a computer via text evolved over two decades, transitioning from physical hardware to sophisticated software. Before the CLI, computers were programmed using physical switches or punched cards. The shift toward a "command" style interaction began with the use of Teleprinters (Teletypes).
GNUGNU ( ) is an extensive collection of free software (387 packages as of June 2025), which can be used as an operating system or can be used in parts with other operating systems. Most of GNU is licensed under the GNU Project's own General Public License (GPL). Richard Stallman, founder of the GNU projectGNU is also the project within which the free software concept originated. Richard Stallman, the founder of the project, views GNU as a "technical means to a social end".
Elo rating systemThe Elo rating system is a method for calculating the relative skill levels of players, originally designed for rating chess players. It is a special case of the Bradley–Terry model.
ChessboardA chessboard is a game board used to play chess. It consists of 64 squares, 8 rows by 8 columns, on which the chess pieces are placed. It is square in shape and uses two colors of squares, one light and one dark (not always), in a checkered pattern. During play, the board is oriented such that each player's near-right corner square is a light square.Computing platformA computing platform, digital platform, or software platform is the infrastructure on which software is executed. While the individual components of a computing platform may be obfuscated under layers of abstraction, the summation of the required components comprise the computing platform.
UnixUnix ( , YOO-niks; trademarked as UNIX) is a family of multitasking, multi-user computer operating systems that derive from the original AT&T Unix, the development of which started in 1969 at the Bell Labs research center by Ken Thompson, Dennis Ritchie, and others.
Free softwareFree software or libre software sometimes known as freedom-respecting software is computer software distributed under free software licenses that allow users to run the software for any purpose as well as to study, change, and distribute it and any adapted versions.
PortingIn software development, porting is the process of adapting software to run in a different context. Often it involves modifying source code so that a program can run on a different platform (i.e. on a different CPU or operating system) or in a different environment (i.e. with a different library or framework). It also describes adapting a change or feature from one codebase to another – even between different versions of the same software.
Source CodeSource Code is a 2011 science fictionaction thriller film directed by Duncan Jones and written by Ben Ripley. It stars Jake Gyllenhaal as a US Army officer who is sent into an eight-minute virtual re-creation of a real-life train explosion, and tasked with determining the identity of the terrorist who bombed it. Michelle Monaghan, Vera Farmiga, and Jeffrey Wright play supporting roles.*As an Amazon Associate I earn from qualifying purchases.