Reversi

Time : 2025-11-15

Introduction

Game Overview

Reversi, commonly known in Chinese as "Heibai Qi" (Black and White Chess), is a strategic board game for two players. Its most famous commercial version is Othello, whose tagline is "A minute to learn, a lifetime to master." The rules are deceptively simple, but mastering the game is challenging. The board state can change dramatically with each move, which is the origin of the phrase "reversing the situation."

Objective of the Game

The player with the most discs of their color facing up at the end of the game wins.

Equipment & Board

Board: An 8x8 grid.
Pieces: Double-sided discs, one side white and the other black. Both players share the discs, using one color each.

Basic Rules & Gameplay

Initial Setup: Four discs are placed in the center of the board in a specific pattern: two black and two white, with same-colored discs on a diagonal.
Turns: Players alternate turns. Black moves first.
Legal Move: A move consists of placing a disc of one's own color on an empty square, outflanking one or more of the opponent's discs.
- A disc is placed such that in at least one straight (horizontal, vertical, or diagonal) line between the new disc and another disc of the same color, there are only one or more contiguous opponent's discs.
- All of the opponent's discs that are outflanked in this way are then flipped to the current player's color.
Passing: If a player cannot make a valid move, they pass their turn. The game ends when neither player can make a legal move.

Ending the Game & Scoring

The game ends when the board is full or when neither player can make a legal move.
Players count the number of discs showing their color. The player with the higher number of discs wins.
If the board is full, it is a draw.

Strategic Depth

The core strategies of Reversi revolve around stable discs, frontier discs, and mobility.

Corners: A disc placed in a corner can never be flipped. Therefore, controlling the corners and the squares around them is paramount.
Stable Discs: These are discs that cannot be flipped for the remainder of the game. Building stable disc formations is key to securing territory.
Avoiding Bad Squares: Some squares (notably the "C-squares" and "X-squares" adjacent to the corners) are dangerous to play early, as they can easily give your opponent access to a corner.
Mobility: In the early and mid-game, it is often more important to maintain a high number of legal moves for yourself while limiting your opponent's options, rather than simply maximizing disc count. This gives you flexibility and control in the later stages.

Othello vs. Reversi Othello is a trademarked version of Reversi. The rules are virtually identical, with the main historical difference being the fixed initial setup. In modern contexts, the names are often used interchangeably.

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