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Onyx is an abstract strategy board game for two players invented by Larry Back in 1995. The game features a rule for capturing, making it unique among connection games. The Onyx gameboard is a grid of interlocking squares and triangles, with pieces played on the points of intersection (as in Go). The board has four sides, each comprising twelve intersection points. White tries to connect the two vertical (white) sides with an unbroken chain of white pieces, while Black tries to connect the two horizontal (black) sides with an unbroken chain of black pieces. The first to do so wins the game. Onyx was featured in several issues of ''Abstract Games'' magazine edited by Kerry Handscomb. ==Game rules== * The initial setup has four black pieces and four white pieces pre-placed (see illustration). * Black moves first by placing a black piece on any empty intersection point. White follows suit.〔Or normally, after Black's initial move the pie rule can be invoked (allowing White the option to switch sides), since moving first conveys an advantage.〕 Turns continue to alternate. * A player may place a piece on the ''midpoint'' of a square ''only when'' all four corner points of that square are unoccupied. * Once placed, pieces do not move; but captured pieces are removed from the game. 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「Onyx (game)」の詳細全文を読む スポンサード リンク
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