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Chess is a recreational and competitive game played between two players. The current form of Chess (sometimes called Western chess or international chess) has an international pedigree which evolved from similar, much older games in India and Persia. The modern form of the game emerged in Southern Europe during the second half of the 15th century. Today, chess is one of the world's most popular games, played by millions of people worldwide at home, in clubs, online, by correspondence, and in tournaments.

The game is played on a square chequered chessboard with 64 squares arranged in an eight-by-eight square. At the start, each player (one controlling the white pieces, the other controlling the black pieces) controls sixteen pieces: one king, one queen, two rooks, two knights, two bishops, and eight pawns. The object of the game is to checkmate the opponent's king, whereby the king is under immediate attack (in "check") and there is no way to remove it from attack on the next move.

The tradition of organized competitive chess started in the sixteenth century and has developed extensively. Chess today is a recognized sport of the International Olympic Committee. The first official World Chess Champion, Wilhelm Steinitz, claimed his title in 1886; Norwegian Grandmaster Magnus Carlsen is the current World Champion. Theoreticians have developed extensive chess strategies and tactics since the game's inception. Aspects of art are found in chess composition.

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Chess tablebase query.png

An endgame tablebase is a computerized database of all chess positions within certain chess endgames. The tablebase reveals the game-theoretical value of each position (win, loss, or draw), and how many moves it will take to achieve that result with perfect play. Thus, the tablebase acts as an oracle, always providing the optimal moves for both White and Black.

Tablebases are generated by retrograde analysis, working backwards from a checkmated or stalemated position. Tablebases have solved chess for every position with six or fewer pieces (including the two kings). The results of the solution have profoundly advanced the chess community's understanding of endgame theory. Some positions which humans had analyzed as draws were proved to be winnable; the tablebase could see a mate in 100 moves or more, far beyond the horizon of both humans and computers. Tablebases have enhanced competitive play and facilitated the composition of chess endgame studies. They provide a powerful analytical tool, enabling students of chess to discover its deepest secrets.

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For chess news, see 2017 in sports, the 2017 in chess category, the current sports events portal, or the Wikinews sports portal. Below is the FIDE rating list of the top 20 players as of December 2017.

Rank Player Rating
1 Norway Magnus Carlsen 2837
2 Armenia Levon Aronian 2805
3 Azerbaijan Shakhriyar Mamedyarov 2799
4 United States Fabiano Caruana 2799
5 France Maxime Vachier-Lagrave 2789
6 United States Wesley So 2788
7 Russia Vladimir Kramnik 2787
8 India Viswanathan Anand 2782
9 United States Hikaru Nakamura 2781
10 China Ding Liren 2777
11 Russia Alexander Grischuk 2772
12 Russia Peter Svidler 2765
13 Russia Sergey Karjakin 2760
14 Netherlands Anish Giri 2752
15 China Yu Yangyi 2751
16 Bulgaria Veselin Topalov 2749
17 Azerbaijan Teimour Radjabov 2748
18 India Pentala Harikrishna 2744
19 China Wei Yi 2743
20 Czech Republic David Navara 2740

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