Tic Tac Toe 3 In Row

This is a mix of 2 games in one, first goes the usual game of tic-tac-toe task in which to score as many points as possible than the opponent, gradually filling the playing field, once it is filled and there are no moves left, the second phase of the game is turned on, now the pieces can be swapped gaining new points. On the freed places can not put new pieces. Wins the one who scores more points. In the second phase of the game you can not only score yourself points but also take away from the opponent, the main thing is not to confuse the pieces otherwise you will subtract points to yourself and add points to the opponent.