Reversi Rules: How to Play & Master Strategy

Reversi is a classic two-player strategy game played on an 8x8 grid. Players take turns trapping opponent disks between their own pieces to flip them, aiming to hold the majority of disks at the end of the game.

Board Setup and Objective

The game is played on a checkered board of 64 squares (8 rows by 8 columns). Play uses two-sided disks that are black on one side and white on the other. The game begins with four disks placed in the central four squares: two black disks and two white disks placed in an alternating diagonal pattern.

Black always moves first. The objective is to outflank and convert as many opponent disks as possible. The game ends when the board is completely filled, or when neither player has any legal moves remaining. The player whose color shows on the majority of disks wins.

Rules of Movement and Flipping

A move consists of placing a single disk on an empty square according to strict placement rules:

• Flanking Requirement: Every move must trap at least one opponent disk in a continuous straight line (horizontal, vertical, or diagonal) between the newly placed disk and another disk of your own color.
• Flipping Disks: All opponent disks trapped in any flanked direction flip over immediately to your color. A single move can flip disks along multiple lines simultaneously.
• No Flanking, No Move: You cannot place a disk on a square unless it traps and flips at least one opponent piece. Empty squares without captures are illegal moves.
• Automatic Pass: If a player has no legal moves on their turn, their turn is automatically forfeited (passed), and the other player moves again. You cannot pass voluntarily if a valid move exists.

Core Strategy for Beginners

Reversi is famous for rapid tactical reversals. Strong fundamentals ensure long-term control:

1. Seize the Four Corners

Corners are the most valuable squares on the board. Once a disk occupies a corner, it can never be outflanked or flipped for the rest of the game. Corners serve as indestructible anchors from which you can safely build stable edges.

2. Beware of C-Squares and X-Squares

The squares directly adjacent to corners (C-squares along the edges, and X-squares diagonally inwards) are dangerous early in the game. Playing onto an X-square often grants your opponent direct access to the adjacent corner on the very next turn.

3. Maximize Mobility (Option Control)

In the opening and midgame, avoid flipping too many disks at once. Having fewer disks on the board often leaves you with more legal move options, while restricting the opponent's choices until they are forced into bad squares.

Origins and History

Reversi was invented in England in the 1880s, credited to Lewis Waterman and John W. Mollett. In 1971, Japanese inventor Goro Hasegawa registered a refined variant named Othello (inspired by Shakespeare's play of dramatic betrayals), standardizing the fixed four-piece central opening and modern competitive tournament rules.

Special Features of this Edition

YesssGames Reversi is built for pure, distraction-free concentration:

• 3 AI Difficulty Levels: Select Easy, Medium, or Hard to match your skill level.
• Hint Dots: Subtle indicators highlight legal moves for fast, intuitive scanning.
• Tabletop Mode (180°): Play face-to-face on the same screen with inverted opponent controls.
• Instant Undo: Misclicks can be corrected with a single tap.
• 100% Cookie-Free: No animations, no screen flicker, and completely ad-free.

Frequently Asked Questions (FAQ)

Can you voluntarily pass your turn in Reversi?

No. If you have even a single legal move available, you are required to play it. A pass occurs only when no legal moves exist anywhere on the board.

Can corner disks ever be flipped back?

Never. Corner disks have no squares beyond them on two perpendicular sides, making it physically impossible to bracket them from the outside.

Does having more disks in the midgame mean you are winning?

Not necessarily. In Reversi, having many disks early can severely limit your future moves. Having fewer, strategically positioned disks with many legal options is often much stronger.

What happens in the event of a tie?

If both players finish with exactly 32 disks on a full 64-square board, the game is ruled an official draw.