Reversi Rules

Reversi (Othero) is a strategy board game played by two players.
The standard Reversi board consists of an 8×8 grid.
Each player uses black or white discs and puts on the cell in board one by one.

The purpose of the game is to flip the opponent's discs to own color.
When the player places a new disc, all of the opponent's pieces between the new disc and an existing disc of the same color are flipped to the player's color.
Reversi is a game that requires strategy depending on disc position and placement.
The rule is simple, so beginners can have fun. Advanced players can also enjoy it as strategy is required.

Board:

Reversi board consists of an 8×8 grid.
The initial placement of discs is on the four center grids. They are arranged as white, black, white, black.

Turn change:

Black moves first.
Players take turns placing a disc, starting with black.
If a player has no available move, they must pass their turn.

Discs placing:

The player places their own disc so that the opponent's discs are positioned between their own discs.
挟む方向は、石を置いたマスから縦横斜めの８方向いずれでも構いません。
置いた石により挟まれた相手の石はすべて自分の色の石になります。
相手の石を挟めないマスには置けません。

End conditions:

When the board is filled with discs, the game ends.
ゲーム終了時、より多くの石を持っているプレイヤーが勝利となります。
石の数が同じ場合、引き分けとなります。
連続して両プレイヤーがパスとなった場合、ゲームは終了します。