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Portable Game Notation (PGN) is a standard plain text format for recording chess games (both the moves and related data), which can be read by humans and is also supported by most chess software. This article uses algebraic notation to describe chess moves.
It is now almost universally used by books, magazines, newspapers and software, and is the only form of notation recognized by FIDE, [2] the international chess governing body. An early form of algebraic notation was invented by the Syrian player Philip Stamma in the 18th century. In the 19th century, it came into general use in German chess ...
Descriptive chess notation was used in English- and Spanish-language literature until the late 20th century, but is now obsolescent. Portable Game Notation (PGN) is a text file format based on English algebraic notation which can be processed by most chess software. Other notation systems include ICCF numeric notation, used for international ...
Time is controlled using a chess clock that has two displays, one for each player's remaining time. Analog chess clocks have been largely replaced by digital clocks, which allow for time controls with increments. Time controls are also enforced in correspondence chess competitions. A typical time control is 50 days for every 10 moves.
If the opponent deals with the discovered attack (obligatory if it is a check), the attacking player will have time to return the moving piece out of harm's way. This scenario is often referred to as a discovered attack (or check) with capture. A discovered check can also win material if the moving piece ends up attacking another undefended piece.
The Chigorin Variation has declined in popularity because Black must spend some time bringing his offside knight on a5 back into the game. 10...d5 is the Gajewski Gambit, sacrificing the e-pawn for open lines. This is less sound than 10...c5, but can be good in practical play. The Chigorin is divided into four ECO classifications. In C96, Black ...
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The most common form of double check involves one piece moving to deliver check and revealing a discovered check at the same time from a piece it had been blocking. The only possible reply to a double check is a king move, as it is impossible to block or capture both checking pieces at once.