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Cylinder chess (or Cylindrical chess) is a chess variant with an unusual board. The game is played as if the board were a cylinder, with the left side of the board joined to the right side. According to Bill Wall, in 947 in a history of chess in India and Persia, the Arabic historian Ali al-Masudi described six different variants of chess, including astrological chess, circular chess and cylinder chess.〔(Earliest chess books and references ) by Bill Wall.〕 Cylindrical board is also used in chess problems. == Rules and gameplay == The game is played as if there is no edge on the side of the board. When a piece goes off the right edge of the board in cylinder chess, it reappears on the left edge; when a piece goes off the left edge, it reappears on the right edge.〔D.B. Pritchard (1994). ''The Encyclopedia of Chess Variants'' (p. 79). ISBN 0-9524142-0-1.〕 It is legal to move a rook from a3 to h3, even if there is a piece on b3, since the rook can move left from a3. A bishop on c1 can go to h4, by moving from c1 to a3, and then going up and left from a3 to h4. Moves that do not change the position, like rook a3-a3 (assuming the 3rd rank is empty), are usually not allowed, but sometimes they are in some problems. It is allowed to capture en passant over the board edge. For example, if White has a pawn on a5, Black on h7 and Black plays h7-h5, White can capture it: axh6. Bishops are more valuable in this variant. And, unlike in standard chess, a king and rook cannot enforce checkmate against a lone king on the cylindrical board. The game is sometimes played with changed rules for castling: * Castling is not allowed. Proponents of this convention argue that the purpose of castling is nullified by all files being equivalent, as they are on a cylinder. * In addition to normal castling, castling with the wrong rook (over the board edge) is also allowed. When castling in this way on the kingside, the king moves from e1 to g1 and the rook on a1 moves to f1. On the queenside, the king moves to c1 and the rook on h1 moves to d1. Some cylinder chess problems allow moves that don't change the position (null moves).〔(From A. W. Mongredien, Bulletin de la FFE, No. 19, 1926 )〕 At the right an example of such a problem is shown. The solution is to put Black in zugzwang by playing 1.Rh4-h4. Now, after any move by Black, White has a mate. The move 1.Rg4 doesn't work because of 1...Ka5 threatening to capture the rook. ==Strategy== In Cylinder chess, the traditional hierarchy of queen, rook, knight/bishop, pawn, is altered, with the bishop becoming more versatile and therefore more deadly than the rook, thereby switching the positions of the bishop and rook. Also, the traditional important center squares, and the common moves of pawn e4, d4, e5, d5, become very vulnerable moves in Cylinder chess, due to the fact that it opens up the player's center to attacks by the bishops which have been allowed access to the side squares. 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「Cylinder chess」の詳細全文を読む スポンサード リンク
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