Free Online Chess Games: Challenge a Grandmaster Computer and Learn from the Best
Start playing chess now against the computer at various levels, from easy level one all the way up to master level. To start the game, simply click on the Start button and start playing the chess computer. When you set up your new game, you can also configure the time control, which means thinking time will also be limited.
Game status:During the ongoing game, the status "It's your move" will usually appear because the computer calculates its moves very quickly, and performs these moves on the chessboard immediately after your move. If the computer program beats you, or you put the computer program into checkmate with the white pieces, then you will see the message "Checkmate. White has won" and can then request a return match, or play another chess player (New Player).
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SparkChess is an excellent way to get better at chess - learn the proper rules (including the elusive en-passant), practice openings, test strategies, use the board editor to recreate famous positions with FEN strings, replay famous games, import/export PGN games and databases (with comments and annotations) and let the computer help you. With 5 levels of difficulty and a behavior modeled to make human mistakes, this is a very fun game to play. Our online chess game also features an opening database created by analysing 145,000 games from international tournaments. There are 4 different board styles (a 2D diagram, two fixed 3D designs and a 3D rotatable board) to suit any style - from the playful kid to the serious tournament player.
Chess Assistant 23 includes grandmaster level playing programs, Chess Opening Encyclopedia mode, a powerful search system, the unique Tree mode, databases of about 8.5 million games in total (Nov. 1, 2022) that can be automaticaly updated 3000 new games every week for free, 3-month access to all courses at Chess King Learn (How to activate Chess King Learn bonus subscription).
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In addition to the grandmaster level engine Rybka 4 coming with the package, Stockfish 15, the confirmed leader among chess playing programs, will be automatically downloaded and plugged in upon installation.
The package includes grandmaster level playing engines, Chess Opening Encyclopedia, a powerful search system, a unique Tree mode, databases of 8.5 million games in total (as of November 1, 2022), 1-year Premium Game Service (3000 new games each week by Internet), 3-month subscription to Chess King Learn with 90+ courses and much more.
Chess Assistant 23 auto-installs the strongest chess engine Stockfish 10, in addition to the good old Rybka 4 that comes with the package. Stockfish is leading in most independent computer chess rating lists. No serious chess player can be without Stockfish!
Chess Assistant is compatible with most modern commercial and free chess engines. It supports a variety of protocols for communicating with chess engines, such as UCI, UCI2, WinBoard and MCS. In layman terms, this means that Chess Assistant gives you an unparalleled choice of chess engines for analysis and play.
Computer 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. Computer chess applications that play at the level of a chess master or higher are available on hardware from supercomputers to smart phones. Standalone chess-playing machines are also available. Stockfish, GNU Chess, Fruit, and other free open source applications are available for various platforms.
Computer chess applications, whether implemented in hardware or software, utilize different strategies than humans to choose their moves: they use heuristic methods to build, search and evaluate trees representing sequences of moves from the current position and attempt to execute the best such sequence during play. Such trees are typically quite large, thousands to millions of nodes. The computational speed of modern computers, capable of processing tens of thousands to hundreds of thousands of nodes or more per second, along with extension and reduction heuristics that narrow the tree to mostly relevant nodes, make such an approach effective.
The first chess machines capable of playing chess or reduced chess-like games were software programs running on digital computers early in the vacuum-tube computer age (1950s). The early programs played so poorly that even a beginner could defeat them. Within 40 years, in 1997, chess engines running on super-computers or specialized hardware were capable of defeating even the best human players. By 2006, programs running on desktop PCs had attained the same capability. In 2006, Monty Newborn, Professor of Computer Science at McGill University, declared: "the science has been done". Nevertheless, solving chess is not currently possible for modern computers due to the game's extremely large number of possible variations.[1]
Chess machines/programs are available in several different forms: stand-alone chess machines (usually a microprocessor running a software chess program, but sometimes as a specialized hardware machine), software programs running on standard PCs, web sites, and apps for mobile devices. Programs run on everything from super-computers to smartphones. Hardware requirements for programs are minimal; the apps are no larger than a few megabytes on disk, use a few megabytes of memory (but can use much more, if it is available), and any processor 300Mhz or faster is sufficient. Performance will vary modestly with processor speed, but sufficient memory to hold a large transposition table (up to several gigabytes or more) is more important to playing strength than processor speed.
Most available commercial chess programs and machines can play at super-grandmaster strength (Elo 2700 or more), and take advantage of multi-core and hyperthreaded computer CPU architectures. Top programs such as Stockfish have surpassed even world champion caliber players. Most chess programs comprise a chess engine connected to a GUI, such as Winboard or Chessbase. Playing strength, time controls, and other performance-related settings are adjustable from the GUI. Most GUIs also allow the player to set up and to edit positions, to reverse moves, to offer and to accept draws (and resign), to request and to receive move recommendations, and to show the engine's analysis as the game progresses.
There are a few chess engines such as Sargon, IPPOLIT, Stockfish, Crafty, Fruit, Leela Chess Zero and GNU Chess which can be downloaded (or source code otherwise obtained) from the Internet free of charge.
Perhaps the most common type of chess software are programs that simply play chess. A human player makes a move on the board, the AI calculates and plays a subsequent move, and the human and AI alternate turns until the game ends. The chess engine, which calculates the moves, and the graphical user interface (GUI) are sometimes separate programs. Different engines can be connected to the GUI, permitting play against different styles of opponent. Engines often have a simple text command-line interface, while GUIs may offer a variety of piece sets, board styles, or even 3D or animated pieces. Because recent engines are so capable, engines or GUIs may offer some way of handicapping the engine's ability, to improve the odds for a win by the human player. Universal Chess Interface (UCI) engines such Fritz or Rybka may have a built in mechanism for reducing the Elo rating of the engine (via UCI's uci_limitstrength and uci_elo parameters). Some versions of Fritz have a Handicap and Fun mode for limiting the current engine or changing the percentage of mistakes it makes or changing its style. Fritz also has a Friend Mode where during the game it tries to match the level of the player.
In the late 1970s chess programs suddenly began defeating highly skilled human players.[9] The year of Hearst's statement, Northwestern University's Chess 4.5 at the Paul Masson American Chess Championship's Class B level became the first to win a human tournament. Levy won his bet in 1978 by beating Chess 4.7, but it achieved the first computer victory against a Master-class player at the tournament level by winning one of the six games.[10] In 1980 Belle began often defeating Masters. By 1982 two programs played at Master level and three were slightly weaker.[9]