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Gess is a strategic board game for two players, involving a grid board and mutating pieces. The name was chosen as a conflation of "chess" and "go". It is pronounced with a hard "g" as in "go", and is thus homophonous with "guess". Gess was created by the ''Puzzles and Games Ring'' of The Archimedeans, and first published in 1994 in the society's magazine Eureka. It was popularized by Ian Stewart's ''Mathematical Recreations'' column in the November 1994 issue of ''Scientific American''. == Rules == * Gess is played on a grid of 18 × 18 ''squares''. * Two players, "Black" and "White", each have 43 stones of their colour on the board in the starting configuration. * Starting with Black, players take turns moving a piece on the board. A move must always change the stone configuration on the board. There is no passing. * A ''piece'' consists of a 3 × 3 grid of squares, at least one of which must exist on the board. Only stones of one colour may be in the grid. There must be at least one stone on the eight squares around the central square. * A piece can only be moved by the player whose stones are inside the grid. * The 3 × 3 grid is termed the ''footprint'' of the piece. Each piece can move as determined by the stones in its footprint: * * The central square determines the extent of the piece's movement. If the square is unoccupied, it may move up to three spaces; if it is occupied by a stone, it may move any number of spaces. * * Each of the eight surrounding squares determines the directions the piece can move. If a square has a stone, the piece can move in the direction indicated by the square's location relative to the central square; if a square is unoccupied, the piece cannot move in that direction. * As a piece moves, all of the stones in its footprint move in unison. * When the footprint of a piece coincides with any other stones on the board, those stones are removed from the board and the move ends. * If the footprint moves partially out of the board, the move ends. The stones of the piece which are on a square that has moved out of the board are removed. * A move also may end before any stone is removed. * A ''ring'' is any piece consisting of eight stones around an empty central square. * The game object is to be the only player with a ring piece on the board: when, at the end of any turn, a player has no ring pieces on the board, that player loses the game. If neither player has a ring piece, the player who has just moved loses. 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「Gess」の詳細全文を読む スポンサード リンク
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