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The Réti endgame study is a chess endgame study by Richard Réti. It was published in 1921 in ''Kagans Neueste Schachnachrichten''. It demonstrates how a king can make multiple threats and how it can take more than one path to a given location, using the same number of moves. It is arguably the most famous endgame study and is covered in many books on the endgame (see chess endgame literature). The procedure is known as the "Réti Maneuver" or "Réti's Idea" , , . Endgame composer Abram Gurvich called the theme "The Hunt of Two Hares" and it appears in many other studies and games . It is also called "chasing two birds at once" . ==The study== White is to move and draw in this position. At first inspection, it appears that White has no hope in drawing. His king is well outside the "square" of the black pawn (see king and pawn versus king endgame) and the king is a long way from supporting his own pawn. However, White can draw by making king moves that have two purposes. One goal is getting in the square of the black pawn, so it can be intercepted and the other is getting to the ''d6'' square to support the promotion of his pawn. The black king will have to spend two tempi to stop the white pawn from promoting, and this is the number of tempi the white king needs to gain in order to get into the square of the black pawn. The second diagram shows the number of ways that the white king can get to various squares in the minimum number of moves. There are nine ways to get to ''d6'', but only one of them allows him to get into the square of the black pawn. The solution is for the white king to follow the path on the diagonal marked by "1" and then follow the dots to intercept the black pawn (if necessary): : 1. Kg7! h4 : 2. Kf6 Kb6 Black has to spend a tempo on preventing the white king from reaching his pawn. If 2... h3 then 3. Ke7 h2 4. c7 Kb7 5. Kd7 and both pawns promote, with a drawn position. : 3. Ke5! Kxc6 Black has to spend another tempo to capture the pawn, to prevent the white king from protecting it. If 3... h3 then 4. Kd6 h2 5. c7 h1=Q 6. c8=Q, draw . Now the white king has gained enough tempi to get in the square of the black pawn and intercept it: : 4. Kf4, draw since the white king can stop the pawn from promoting (e.g. 4... h3 5. Kg3 h2 6. Kxh2) . 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「Réti endgame study」の詳細全文を読む スポンサード リンク
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