Chess endgame one with more using the standard piece point count system) should try to exchange pieces (knights, bishops, rooks, and queens), while avoiding the exchange of pawns. This generally makes it easier to convert a material advantage into a won game. The defending side should strive for the opposite. Chess players classify endgames according to the type of pieces that remain. Endgames can be divided into three categories: This article generally does not consider studies. An endgame is when there are only a few pieces left. There is no strict criterion for when an endgame begins, and different experts have different
Chess and is provably less than 10, 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. Typically an average position has thirty to forty possible moves, but there may be as few as zero (in the case of checkmate or stalemate) or (in a constructed position) as many as 218. Chess has inspired many combinatorial puzzles, such as the knight's tour and the eight queens puzzle. The idea of creating a chess-playing machine dates to the 18th century; around 1769, the chess-playing automaton