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+\section{Previous works}
+
+\subsection{SGF}
+
+SGF (\textit{Smart Go Format} or \textit{Smart Game Format}) is a text file
+format specification for records of games or even collections of them. It was
+devised for Go but it supports other games with similar turns structure. It
+supports move variations, annotations, setups and game metadata. By supporting
+SGF, our application can be used to analyse existing games registered by other
+applications, such as those played on online Go servers.
+
+The SGF specification can be found at
+\url{https://www.red-bean.com/sgf/user_guide/index.html}
+
+\subsection{GTP}
+
+GTP (\textit{Go Text Protocol}) is a text based protocol for communication with
+computer go programs. [ref https://www.lysator.liu.se/~gunnar/gtp/] It is the
+protocol used by GNU Go and the more modern and powerful KataGo. By supporting
+GTP, our application can be used with existing GUIs and other programs, making
+it easier to use it with the tools users are already familiar with.