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In the game of Go, opening theory is the strategy of where, why, in what order, and in what shapes the first several moves are played.〔The opening is normally around 20 ply long.〕 The middle game typically begins once the basic foundational areas called ''frameworks''〔Framework in English translates to ''moyo'' in Japanese.〕 are established and "fighting" begins.〔This occurs when moves directly attack an opponent's weak groups, with the serious possibility of killing it.〕 The opening is conceptually and traditionally divided for study into the sequences that are ''whole board'' openings 〔The Japanese term ''fuseki'' is also current in English.〕 and those that are ''corner'' openings.〔''Joseki'' in Japanese, meaning 'set pattern', is current in English usage.〕 Each type constitutes a series of plays which have been studied for their balance (with the other) as well as for countermoves. For a standard board,〔I.e. a 19x19 line goban; essentially no theory for smaller boards gets into print.〕 the most basic single concept for the opening is that ''plays in the corners are more efficient for making territory than plays on the sides or in the center.'' == Concepts == Opening theory is less dominant in terms of study, for those wanting to reach a good amateur level, than in chess or ''shogi''. It is, however, an important component of Go knowledge, though there is no single, codified source for it.〔There are 'joseki dictionaries' and 'fuseki dictionaries'. The largest joseki dictionaries contain around 50000 variations; the usual estimate is that a professional player would know about 10% of that number of corner opening lines. Fuseki dictionaries have never been produced in any comparable degree of comprehensiveness; the Large Fuseki Dictionary (布石大事典) of the Nihon Ki-in has around 1000 representative openings.〕 The standard sequences for the joseki in many cases come to a definite end, after which both players should move elsewhere. In some cases a sharp local struggle breaks out, which neither player should neglect. For those cases, the result of the opening may develop out of a 10×10 corner area into the rest of the board. Analysis without taking into account what other stones are in place then becomes somewhat meaningless. The longest 'book' corner openings are about 50-ply.〔There are some localised variations of this length in the ''kado'' variation of the ''nikkentakabasami'', and in the ''taisha'', where in fact a ko fight may arise.〕 Most corner openings do not have special or picturesque names. A few that do are known by Japanese names: the ''taisha'', the ''nadare'' (avalanche), the (Magic sword of Muramasa ). These are among the most complex, and are contraindicated for novices. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Go opening theory」の詳細全文を読む スポンサード リンク
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