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Under "Equipment", the article states that the board can be any dimension of rectangle. It's slightly odd that there is no mention of any particular sizes being traditionally preferred.
But more worrying than this is the statement under "Rules and Game Play", that there is always a two-by-two square of cells in the center of the board. This is only true for rectangular boards with both dimensions being even. If either dimension is odd, there will be no central two-by-two square, and the game can't be played by the rules stated.
Unfortunately, I don't know Kōnane, so I don't know whether odd-dimension boards are not allowed (in which case the "Equipment" section should specify that the board dimensions must be even) or whether they are allowed but have different legal opening voids from the even-dimensioned ones. Does anybody know the answer? At the moment, I can't access the PDF papers, and the other references don't address this question. (The Hawai`ian site is charming, though!) ACW (talk) 00:12, 22 April 2012 (UTC)