Sygo

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Sygo is a two player abstract strategy game created in 2010 by Christian Freeling.^[1][2] It is a variant of Go.^[3] Sygo is played on a 19x19 grid of lines. It differs from Go in that captured stones change colors instead of being removed from the board, similar to Reversi/Othello. Additionally, each turn, players may either place a new stone, or else grow all of their existing groups of stones by placing a new stone adjacent to each group, similar to Symple, another of Christian Freeling's games.^[4][5] The goal of Sygo is to control the most territory on the board as determined by the number of a player's stones on the board as well as empty points surrounded by the players stones. The game ends either when one player resigns or both players pass on successive turns.^[4]