Specific plans or strategic themes will often arise from particular groups of openings which result in a specific type of pawn structure. An example is the minority attack , which is the attack of queenside pawns against an opponent who has more pawns on the queenside.
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The study of openings is therefore connected to the preparation of plans that are typical of the resulting middlegames. Another important strategic question in the middlegame is whether and how to reduce material and transition into an endgame i. Minor material advantages can generally be transformed into victory only in an endgame, and therefore the stronger side must choose an appropriate way to achieve an ending. Not every reduction of material is good for this purpose; for example, if one side keeps a light-squared bishop and the opponent has a dark-squared one, the transformation into a bishops and pawns ending is usually advantageous for the weaker side only, because an endgame with bishops on opposite colors is likely to be a draw, even with an advantage of a pawn, or sometimes even with a two-pawn advantage.
The endgame also end game or ending is the stage of the game when there are few pieces left on the board. There are three main strategic differences between earlier stages of the game and the endgame: . Endgames can be classified according to the type of pieces remaining on the board. Basic checkmates are positions in which one side has only a king and the other side has one or two pieces and can checkmate the opposing king, with the pieces working together with their king.
For example, king and pawn endgames involve only kings and pawns on one or both sides, and the task of the stronger side is to promote one of the pawns. Other more complicated endings are classified according to pieces on the board other than kings, such as " rook and pawn versus rook " endgames. These two aspects of the gameplay cannot be completely separated, because strategic goals are mostly achieved through tactics, while the tactical opportunities are based on the previous strategy of play. A game of chess is normally divided into three phases: the opening , typically the first 10 moves, when players move their pieces to useful positions for the coming battle; the middlegame ; and last the endgame , when most of the pieces are gone, kings typically take a more active part in the struggle, and pawn promotion is often decisive.
In chess, tactics in general concentrate on short-term actions — so short-term that they can be calculated in advance by a human player or a computer. The possible depth of calculation depends on the player's ability. In quiet positions with many possibilities on both sides, a deep calculation is more difficult and may not be practical, while in positions with a limited number of forced variations, strong players can calculate long sequences of moves. Theoreticians describe many elementary tactical methods and typical maneuvers, for example: pins , forks , skewers , batteries , discovered attacks especially discovered checks , zwischenzugs , deflections , decoys , sacrifices , underminings , overloadings , and interferences.
A common type of chess exercise, aimed at developing players' skills, is a position where a decisive combination is available and the challenge is to find it. Chess strategy is concerned with evaluation of chess positions and with setting up goals and long-term plans for the future play.
During the evaluation, players must take into account numerous factors such as the value of the pieces on the board, control of the center and centralization, the pawn structure , king safety, and the control of key squares or groups of squares for example, diagonals, open files, and dark or light squares. The most basic step in evaluating a position is to count the total value of pieces of both sides. The king is more valuable than all of the other pieces combined, since its checkmate loses the game. But in practical terms, in the endgame the king as a fighting piece is generally more powerful than a bishop or knight but less powerful than a rook.
Another important factor in the evaluation of chess positions is the pawn structure sometimes known as the pawn skeleton : the configuration of pawns on the chessboard.
Weaknesses in the pawn structure, such as isolated , doubled , or backward pawns and holes , once created, are often permanent. Care must therefore be taken to avoid these weaknesses unless they are compensated by another valuable asset for example, by the possibility of developing an attack.
Contemporary chess is an organized sport with structured international and national leagues, tournaments, and congresses. FIDE is a member of the International Olympic Committee ,  but the game of chess has never been part of the Olympic Games ; chess does have its own Olympiad , held every two years as a team event. Invitation-only tournaments regularly attract the world's strongest players. Besides these prestigious competitions, there are thousands of other chess tournaments, matches, and festivals held around the world every year catering to players of all levels.
Chess is promoted as a "mind sport" by the Mind Sports Organisation , alongside other mental-skill games such as contract bridge , Go , and Scrabble. The best players can be awarded specific lifetime titles by the world chess organization FIDE: . All the titles are open to men and women.
Beginning with Nona Gaprindashvili in , a number of women have earned the GM title, and most of the top ten women in hold the unrestricted GM title. As of [update] , there are active grandmasters and international masters in the world.
The top three countries with the largest numbers of grandmasters are Russia, the United States, and Germany, with , 98, and 96, respectively. FIDE also awards titles for arbiters and trainers. International titles are awarded to composers and solvers of chess problems and to correspondence chess players by the International Correspondence Chess Federation. National chess organizations may also award titles, usually to the advanced players still under the level needed for international titles; an example is the chess expert title used in the United States.
Elo is a statistical system based on the assumption that the chess performance of each player in his or her games is a random variable. Arpad Elo thought of a player's true skill as the average of that player's performance random variable, and showed how to estimate the average from results of player's games. The US Chess Federation implemented Elo's suggestions in , and the system quickly gained recognition as being both fairer and more accurate than older systems; it was adopted by FIDE in Chess composition is the art of creating chess problems also called chess compositions.
The creator is known as a chess composer. Chess composition is a distinct branch of chess sport, and tournaments exist for both the composition and solving of chess problems. It seems impossible to catch the advanced black pawn, while the black king can easily stop the white pawn. The solution is a diagonal advance, which brings the king to both pawns simultaneously:. Both sides will queen, resulting in a draw. Chess has a very extensive literature. In , the chess historian H. Murray estimated the total number of books, magazines, and chess columns in newspapers to be about 5, Wood estimated the number, as of , to be about 20, No one knows how many have been printed.
The game structure and nature of chess are related to several branches of mathematics. Many combinatorical and topological problems connected to chess have been known for hundreds of years. The number of legal positions in chess is estimated to be about 10 43 , and has been proved to be fewer than 10 47 ,   with a game-tree complexity of approximately 10 The game-tree complexity of chess was first calculated by Claude Shannon as 10 , a number known as the Shannon number.
Chess has inspired many combinatorial puzzles, such as the knight's tour and the eight queens puzzle.
Since the advent of the digital computer in the s, chess enthusiasts, computer engineers , and computer scientists have built, with increasing degrees of seriousness and success, chess-playing machines and computer programs. The chess machine is an ideal one to start with, since: 1 the problem is sharply defined both in allowed operations the moves and in the ultimate goal checkmate ; 2 it is neither so simple as to be trivial nor too difficult for satisfactory solution; 3 chess is generally considered to require "thinking" for skillful play; a solution of this problem will force us either to admit the possibility of a mechanized thinking or to further restrict our concept of "thinking"; 4 the discrete structure of chess fits well into the digital nature of modern computers.
CHESS 3. Nowadays, chess programs compete in the World Computer Chess Championship , held annually since At first considered only a curiosity, the best chess playing programs have become extremely strong. In , a mobile phone won a category 6 tournament with a performance rating chess engine Hiarcs 13 running on the mobile phone HTC Touch HD won the Copa Mercosur tournament with nine wins and one draw. With huge databases of past games and high analytical ability, computers can help players to learn chess and prepare for matches. Internet Chess Servers allow people to find and play opponents worldwide.
The presence of computers and modern communication tools have raised concerns regarding cheating during games, most notably the " bathroom controversy " during the World Championship. In , Ernst Zermelo used chess as a basis for his theory of game strategies, which is considered as one of the predecessors of game theory. The category, game theoretical taxonomy of chess includes: two player, no-chance, combinatorial, Markov state present state is all a player needs to move; although past state led up to that point, knowledge of the sequence of past moves is not required to make the next move, except to take into account of en passant and castling, which do depend on the past moves , zero sum, symmetric, perfect information, non-cooperative, discrete, extensive form tree decisions, not payoff matrices , and sequential.
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Some applications of combinatorial game theory to chess endgames were found by Elkies There is an extensive scientific literature on chess psychology. De Groot showed that chess masters can memorize positions shown for a few seconds almost perfectly. The ability to memorize does not alone account for chess-playing skill, since masters and novices, when faced with random arrangements of chess pieces, had equivalent recall about six positions in each case.
Rather, it is the ability to recognize patterns, which are then memorized, which distinguished the skilled players from the novices. When the positions of the pieces were taken from an actual game, the masters had almost total positional recall. More recent research has focused on chess as mental training ; the respective roles of knowledge and look-ahead search; brain imaging studies of chess masters and novices; blindfold chess ; the role of personality and intelligence in chess skill; gender differences; and computational models of chess expertise.
The role of practice and talent in the development of chess and other domains of expertise has led to much recent research. Ericsson and colleagues have argued that deliberate practice is sufficient for reaching high levels of expertise in chess. For example, Fernand Gobet and colleagues have shown that stronger players started playing chess at a young age and that experts born in the Northern Hemisphere are more likely to have been born in late winter and early spring. Compared to general population, chess players are more likely to be non-right-handed, though they found no correlation between handedness and skill.
A relationship between chess skill and intelligence has long been discussed in the literature and popular culture. Academic studies of the relationship date back at least to There are more than two thousand published chess variants,  most of them of relatively recent origin,  including:.
Prime sources in English describing chess variants and their rules include David Pritchard 's encyclopedias,  the website The Chess Variant Pages created by Hans Bodlaender with various contributors, and the magazine Variant Chess published from George Jellis to the British Chess Variants Society.
In the context of chess variants, regular i. FIDE chess is commonly referred to as Western chess , international chess , orthodox chess , orthochess , and classic chess.
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From Wikipedia, the free encyclopedia. This article is about the Western board game. For other chess games or other uses, see Chess disambiguation.
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Strategy board game. Part of a Staunton chess set Left to right: white king , black rook , black queen , white pawn , black knight , white bishop. Main article: Rules of chess. Initial position, first bottom row: rook, knight, bishop, queen, king, bishop, knight, and rook; second row: pawns. Moves of the king. Moves of a rook. Moves of a bishop. Moves of the queen.