肩ツキ

出典: フリー百科事典『ウィキペディア(Wikipedia)』
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肩ツキ囲碁用語の一つで、相手の石の斜め上に打つ手を指す。文字通り、相手の石の「肩」を上方から衝く手段で、「カタツキ」とカタカナで表記されることも多い。動詞では「肩をつく」と表現される。

下図黒1が肩ツキの一例である。

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肩ツキという術語は、相手の石より上の位置に打つ場合を指す。下図のように低位に打つ場合は、「カド」という言葉が使われる。

(カドの例)

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肩ツキの例[編集]

消しの肩ツキ[編集]

肩ツキは、相手の模様を消す手段としてよく用いられる。

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図のような局面では、白aあたりに囲われると手のつけにくい大模様が完成する。その前に、黒1の肩ツキによる消しが絶好となる。

黒5までと軽く逃げ出して、この石はそう厳しい攻めを受けない。

AIの肩ツキ[編集]

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AlphaGoをはじめとした、モンテカルロ法を基礎とする囲碁対戦ソフトウェアは、肩ツキを多用する傾向にある[1]。上図は2016年のAlphaGo対李世ドル第2局においてAlphaGoが放った肩ツキ。第四線の石への肩ツキはそれまでの常識にない手で、世界に衝撃を与えた。

参考文献[編集]

  1. ^ 「囲碁AI新時代」p. 38 マイナビ出版, 王銘エン