// If computer can win on next move, make that move
	for(int move = 0; move < board.size(); ++move)
	{
		if (isLegal(move, board))
		{
			board[move] = computer;
			if (winner(board) == computer)
			{
				cout << move << endl;
				return move;
			}
			// done checking this move, undo it
			board[move] = EMPTY;
		}
	}

	// If human can win on enxt move, block that move
	char human = opponent(computer);
	for(int move = 0; move < board.size(); ++move)
	{
		if (isLegal(move, board))
		{
			board[move] = human;
			if (winner(board) == human)
			{
				cout << move << endl;
				return move;
			}
			// done checking this move, undo it
			board[move] = EMPTY;
		}
	}