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Alice Chess is a chess variant invented in 1953 by V. R. Parton which employs two chessboards rather than one, and a slight (but significant) alteration to the standard rules of chess. The game is named after the main character "Alice" in Lewis Carroll's work ''Through the Looking-Glass'', where transport through the mirror into an alternate world is portrayed on the chessboards by the after-move transfer of chess pieces between boards A and B. This simple transfer rule is well known for causing disorientation and confusion in players new to the game, often leading to surprises and amusing mistakes as pieces "disappear" and "reappear" between boards, and pieces interposed to block attacks on one board are simply bypassed on the other. This "nothing is as it seems" experience probably accounts for Alice Chess remaining Parton's most popular and successful variant among the numerous others he invented. }} ==Move rules== Pieces move the same as they do in standard chess, but a piece transfers at the completion of its move to the opposite board. This simple change has dramatic impact on gameplay. At the beginning of the game, pieces start in their normal positions on board A, while board B starts empty. After each move is made on a given board, the moved piece is transferred (goes "through the looking-glass") to the corresponding square on the opposite board. (So, if a piece is moved on board A, it is transferred to board B at the completion of its move; if the piece started on board B, it ends up on board A.) For example, after the opening moves 1. Nf3 e6, the white knight and black pawn transfer after moving on board A to their corresponding squares on board B. If the game continued 2. Ne5 Bc5, the knight returns to board A and the bishop finishes on board B (see diagram). A move in Alice Chess has two basic stipulations: the move must be legal on the board on which it is played, and the square transferred to on the opposite board must be vacant. (Consequently, capture is possible only on the board a piece currently stands: pieces on board A can capture only pieces on board A; pieces on board B can capture only pieces on board B.) After capture, the capturing piece transfers to the opposite board the same as a non-capturing move. To demonstrate, if the above game continued 3. Nxf7, the knight transfers to board B. Then with Black to move, both 3...Kxf7 and 3...Bxf2+ are not possible. Black cannot play 3...Qd4 either, since the queen may not hop over the pawn on d7. But the move 3... Bg1 ''is'' possible (see diagram), despite the fact a white pawn sits on f2 on board A. (The bishop move on board B is legal, and the square transferred to, g1 on board A, is vacant.) A final stipulation applies specially to moves by the king: a king may not transfer to a vacant square on the opposite board, if this would put the king in check. Castling is largely regarded as permitted in Alice Chess. The ''en passant'' rule is normally not used, but can be. 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「Alice chess」の詳細全文を読む スポンサード リンク
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