The World Chess Federation (Federation Internationale des Echecs, FIDE) hosts the World Championship Matches. A list of the World Chess Championships can be found here.
The classic encounters between Garry Kasparov and Anatoly Karpov in the 1980s. In 1984, after 48 games had been played between Karpov and Kasparov for the World Championship Match, FIDE president Florencio Campomanes canceled the event while it was still in progress, by indicating that the match had "exhausted the physical, if not the psychological resources, of not only the participants but all those connected with the match...". No winner was declared, so Anatoly Karpov retained the title, of course.
Other World Chess Championship matches are:
Grand Chess Tour is a circuit of international events that demonstrates the highest level of organization for the world's best players. The 2015 Tour was created in partnership between the Chess Club and Scholastic Center of Saint Louis (Sinquefield Cup), Tower AS (Norway Chess 2015) and Chess Promotions, Ltd. (London Chess Classic). This circuit was possible because the legendary Garry Kasparov, one of the world's greatest ambassadors for chess, inspired the Grand Chess Tour and helped solidify the partnership between the organizers. His tireless efforts to popularize the game around the world mirror the goals and ambitions of the Grand Chess Tour. It also broadcasts live games.
(under development)
Several chess engines have been developed throughout the years. The one that has been mostly discussed is the Deep Blue. It was developed by IBM and it was used to play against GM Gary Kasparov.
You can play chess online at diverse locations such as ChessBase and chess.com. The JChess, a simple engine on the right, was developed in JAVA by Lokasoft. If you can beat the JChess engine five times consecutively, you are ready to pursue to the next phase. Click here to play with the Lokasoft chess engine. It requires JAVA-ready browser (e.g., Firefox). Otherwise, try the Gary Linscott's Chess Player (below) or the p4wn.
Feeling nostalgic? Do you remember SARGON? It was one of the most popular chess games in the 80's for TRS-80 computers. SARGON I was released on 1978 and SARGON II was released on 1979. The name "Sargon" was taken from either of the historical kings Sargon of Akkad (the first king to use his empire to try to conquer the known world) or Sargon of Assyria. The name was originally written entirely in capitals because TRS-80 did not support lower-case text. More information about Sargon and MicroChess.
If you want to go back in time and have that same feeling of anxiety and ecstasy when playing Sargon for the first time... click here to play against Sargon online again using a TRS-80 emulator. The creators of SARGON, Kathe and Dan Spracklen , wrote First steps in computer chess programming in 1978 for Z-80 microprocessor computers. They explain the logic and procedures behind SARGON I.
This web page by Ed Schröder lists some chess programs that are free of charge. I have not personally checked these programs. The p4wn is another Javascript chess player.
Use the Chess Game Analysis with Stockfish to evaluate your game.
There are several chess game notations. The most commonly and widely used is the PGN. You can replicate chess games by pasting the PGN notation into the text box below and hitting the play button. You may download programs that reads chess games in PGN notation such as ChessBase Light.
The game below was played by Bobby Fischer versus Tigran Petrosian during "The Match of the Century - USSR versus the Rest of the World" in Belgrade, March 29 - April 5, 1970. In order to replicate the game, copy the text and paste into the text box below and hit the play button. More games from Fischer and Petrosian can be found here.
These games were played against the Gary Linscott's Javaschipt Chess Player (Black). Just copy and paste it into the PGN player below.
The 12 games (4 rapid: 25 min, and 8 blitz: 5 min) of a revenge match were played by ex-champions Gary Kasparov and Anatoly Karpov on September 21-24, 2009 in Valencia, Spain to celebrate the 25 anniversary of their historical match for the world’s champion title in Moscow (1984-1990). Select pgn4web or Chess Viewer Deluxe (Firefox only) to reproduce their 2009 games. The other games are listed above.
Chess.com maintains discussion forums of many chess games around the world, including the world championships.
The chess24 lists several championships and broadcasts games live.
Chessgames.com has many games in PGN format.
Chess viewers based on Javascript, including pgn4web, Palview, Chess Tempo, and LT-Pgn-Viewer. Chess viewers based on JAVA may not work because of new internet browser regulations that applet are not acceptable anymore, including : Chess Viewer Deluxe, MyChess, ChessViewer, and Misty Beach PGN Viewer Applet. More chess applets can be found here.
Chess diagrams can be found in these sites: Chess Word Macros & Fonts and Chess Diagrams.
The Chess Programming Wiki maintains a list of Java and Javascript chess engines. Chess players include Oscar Toledo G., Gary Linscott and p4wn.
Chess Olympiads by Wikipedia.