Basics
Reversi is played on an 8×8 board with discs that are black on one side and white on the other.
Players take turns to move, with black always moving first. If a player can’t move then their turn is forfeited, and their opponent moves again. When neither player can move the game is over.
Moves
A move is made by playing a disc in an unoccupied square. Each move must capture at least one of the opponent’s pieces.
When a disc is placed, any continuous run of your opponent’s pieces between that disc and another of your discs will be captured. Captures can be made horizontally, vertically, or diagonally.
Captured pieces flip over, changing from your opponent’s colour to your colour.
To get an idea of how to play, start a new game with the computer playing against itself.
Winning
The game is over when no more moves are possible, either because all squares are occupied or because neither player can capture.
The player with the most pieces is the winner. In the event of both players having the same number of pieces the game is tied.