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I recall seeing this before, called "crazy" tic tac toe: http://tictactoe-cssi.appspot.com/ http://tictactoe-cssi.appspot.com/ via: http://neil.fraser.name/new

• deanclatworthy 13y ago
  The first of these doesn't follow the same rules as OP. It seems that you can retake a board if you get a new row in a box that has already been won.