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Players move alternately, starting with the player controlling the black discs.
Each move consists of placing a single disc of a player's color to any empty cell of the board that results in flipping at least one disc.
After placing the disc, a player flips all discs of the opponent's color lying on a straight horizontal, vertical or diagonal line between the newly placed disc and other discs of the player's color already placed on the board. Important notice: the opponent's discs are flipped if and only if there are no gaps (empty cells) between the newly placed disc and other player's discs.
Below are several examples
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| If the black disc is placed in the specified cell then four white discs in three directions are flipped. |
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| If the black disc is placed in the specified cell then just a single white disc is flipped (in the upper right direction). The white disc in the upper direction is not flipped because there is a gap (empty cell) between the newly placed black disc and the white disc. |
If one player cannot make a valid move then the turn is passed to his opponent. When both players have no legal moves, the game ends. This occurs in the following situations:
- the board is full of discs (i.e. there are no empty cells left on the board)
- one player has no more discs on the board
- the board is not full and there are discs of both colors on the board but neither player can place a disc that flips at least one opponent's disc.
When the game ends the player with the most discs on the board wins.
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Reversi (more recently also known as Othello) is a two-player board game that was invented around 1880 by two Englishmen, Lewis Waterman and John W. Mollett.
