The Smart Game Format (SGF) is a computer file format used for storing records of board games. Games currently supported are Amazons, Ataxx, Backgammon, Byte, Chase, Chess, DVONN, Exxit, Focus, Gess, GIPF, Go, Gobblet, Gomoku+Renju, Hex, Hive, Hnefatafl, Jungle, Kropki, Kuba, Lines of Action, Neutron, Nine Men's Morris, Octi, Philosopher's Football, Plateau, PÜNCT, Quadrature, Reversi (Othello), Sahara, Shogi, TAMSK, Tantrix, Trax, Tripples, Tumbling Down, TwixT, Xiangqi, YINSH and ZÈRTZ.
Go is the game that is most commonly represented in this format and is the default.
SGF uses a tree-based representation of the game to store information; the tree structure makes the addition of variations simple. It is also text-based instead of binary for the sake of portability.