atoll player connection game play hexagonally tessellate board board surround quotislandsquot stone alternate black island white island go board black connect black island opposite side board contiguous chain black stone island chain example black form bridge north west island second bridge west south island win likewise white white islandslike hex completely filledin board result win connection exactly playersatoll characterise generalisation hex number island generalized atoll play multiple islandsonline play yucata turnbase

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