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[[FILE:Othello (Reversi) board.jpg|border|right|thumb|Reversi/Othello <ref>[https://en.wikipedia.org/wiki/Reversi Reversi from Wikipedia]</ref> ]]

or differing in not having a defined starting position, '''Reversi''', is a [https://en.wikipedia.org/wiki/Two-player_game two-player] [https://en.wikipedia.org/wiki/Zero-sum_%28game_theory%29 zero-sum] and [https://en.wikipedia.org/wiki/Perfect_information perfect information] [https://en.wikipedia.org/wiki/Abstract_strategy abstract strategy] [https://en.wikipedia.org/wiki/Board_game board game], usually played on a board with 8 rows and 8 columns and a set of light and a dark turnable pieces for each side. The player's goal is to have a majority of their colored pieces showing at the end of the game, turning over as many of their opponent's pieces as possible. The dark player makes the first move from the starting position, alternating with the light player. Each player has to place a piece on the board such that there exists at least one straight (horizontal, vertical, or diagonal) occupied line of opponent pieces between the new piece and another own piece. After placing the piece, the side turns over (flips, captures) all opponent pieces lying on any straight lines between the new piece and any anchoring own pieces.

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