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Join Five (also known as Morpion solitaire, Cross 'n' Lines or Line Game) is a paper and pencil game for one or two players, played on a plus-shaped grid of dots. The origins of the game are probably in northern Europe. References to the game first appeared in French publications in the 1970s.〔Christian Boyer, ("Morpion Solitaire – Origin (and references therein)" ), accessed August 8, 2010.〕 In addition to being played recreationally, the game has been the subject of theoretical studies〔E. D. Demaine ''et al.'' (2006). ("Morpion Solitaire" ), ''Theory of Computing Systems'' 39:3 pp. 439–453.〕 and computer searches for solutions.〔T. Cazenave, ("Reflexive Monte-Carlo Search" ), Computer Games Workshop 2007.〕 ==How to play== An initial grid of dots are drawn; a square of 4x4 dots, with a rectangle of 4x3 added to each side. The initial cross is outlined in some versions of the game. During each turn, draw a straight line that is exactly five "dots" long, such that: *No part of the new line can retrace any portion of a previously drawn line. In the outlined version, the line can continue an existing line (they must not overlap). *Exactly one of the five dots covered by the new line is missing from the grid before the line is drawn. This missing dot (which can be at either end of the new line, or somewhere in the middle) is also drawn during the turn. *In the only outlined version, if no new dot is needed when drawing the line, the dot may be saved and can be used in later turns. In other words, make a five-segment line from four dots, and draw in the fifth (unless it is saved to draw two dots in later turns). 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「Join Five」の詳細全文を読む スポンサード リンク
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