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SOS (game)
SOS is a (usually two-player but may be more) game played with paper and pencil. It is similar to tic-tac-toe but with more complexity.
Before play begins, a square grid of at least 3x3 squares in size is drawn. Players take turns to add either an "S" or an "O" to any square, with no requirement to use the same letter each turn. The object of the game is for each player to attempt to create the straight sequence S-O-S among connected squares (either diagonally, horizontally, or vertically), and to create as many such sequences as they can. If a player succeeds in creating an SOS, that player immediately takes another turn, and continues to do so until no SOS can be created on their turn. Otherwise turns alternate between players after each move.〔.〕
Keeping track of who made which SOSs can be done by, e.g., one player circling their SOSs and the other player drawing a line through theirs. Once the grid has been filled up, the winner is the player who made the most SOSs. If the grid is filled up and the number of SOSs for each player is the same, then the game is a draw.
SOS is a game of skill and an abstract strategy game. It is also a combinatorial game (when played with two players). In terms of game theory, it is a zero-sum, sequential game with perfect information.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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