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Chess initial position. The game of chess is commonly divided into three phases: the opening, middlegame, and endgame. [1] There is a large body of theory regarding how the game should be played in each of these phases, especially the opening and endgame.
On certain Internet chess servers, such as Chess.com and Lichess, this kind of move is marked as an "inaccuracy", denoting a weak move, appearing more regularly than with most annotators. A sacrifice leading to a dangerous attack that the opponent should be able to defend against if they play well may receive a "?!".
Chess theory divides chess games into three phases with different sets of strategies: the opening, the middlegame, and lastly the endgame. There is no universally accepted way to delineate the three phases of the game; the middlegame is typically considered to have begun after 10–20 moves, and the endgame when only a few pieces remain.
A variant first described by Claude Shannon provides an argument about the game-theoretic value of chess: he proposes allowing the move of “pass”. In this variant, it is provable with a strategy stealing argument that the first player has at least a draw thus: if the first player has a winning move in the initial position, let him play it, else pass.
Chess strategy is the aspect of chess play concerned with evaluation of chess positions and setting goals and long-term plans for future play. While evaluating a position strategically, a player must take into account such factors as the relative value of the pieces on the board, pawn structure, king safety, position of pieces, and control of key squares and groups of squares (e.g. diagonals ...
Tablebases have profoundly advanced the chess community's understanding of endgame theory. Some positions which humans had analysed as draws were proven to be winnable; in some cases, tablebase analysis found a mate in more than five hundred moves, far beyond the ability of humans, and beyond the capability of a computer during play.
The light squared weaknesses are covered by minor pieces (Bd3, Nd2). If permitted to do so, White may launch a direct kingside attack involving ideas such as Bxh7, Qh5 and Rf3-h3. A 1981 article in Chess Life magazine [ 2 ] gave the following line as an example of how play can develop if Black defends weakly.
The Hedgehog is a pawn formation in chess adopted usually by Black that can arise from several openings. Black exchanges the pawn on c5 for White's pawn on d4, and then places pawns on the squares a6, b6, d6, and e6. These pawns form a row of "spines" behind which Black develops their forces.