The Historical and Mechanical Divergence

To understand the strategic landscape of the modern game, one must first navigate the complex historical schism between Reversi and Othello. While visually indistinguishable to the layperson—both played on an 8×8 monochromatic grid with disc-like pieces—the two games represent distinct rule sets with profoundly different strategic equilibria.

Lewis Waterman patented Reversi in 1888, successfully registering the trademark that would survive into the 21st century. Waterman's marketing strategy was aggressive and socially targeted; he published the rules and strategies in The Queen, a lifestyle magazine focusing on "affairs of interest to ladies," positioning the game as a sophisticated domestic activity rather than a tavern game.

Waterman's version was played on a standard 64-square grid, identical to a chessboard. His primary innovation was the dynamic nature of the "reversal"—the idea that a single move could dramatically shift the board's polarity, a concept that resonated with the Victorian fascination with reversals of fortune.

Contesting Waterman's supremacy was John W. Mollett, who claimed to have invented the game nearly two decades prior, in 1870, under the title The Game of Annexation (or simply Annex). Mollett's claim highlights a critical morphological evolution in the game's hardware. Unlike Waterman's square board, Mollett's Annexation was played on a cruciform (cross-shaped) board.

Mollett attempted to market his version as a "game of reverses," but Waterman's preemptive trademarking of the word Reversi forced Mollett to rely on the title Annexation, which failed to capture the public imagination with the same vigor.

The late 19th century also saw the emergence of Royal Reversi, a complex variant played with cubes rather than flat discs. In this iteration, the pieces had six different colors on their faces, allowing for up to six players. The mechanics involved rotating the cubes to match the player's color rather than flipping them, introducing a tactile dimensionality that was eventually streamlined out of the game in favor of the binary black-and-white aesthetic.

By the mid-20th century, Reversi had largely faded into obscurity, relegated to the status of a generic public-domain game. Its resurrection and standardization as a competitive sport occurred in post-war Japan, driven by the vision of Goro Hasegawa.

Goro Hasegawa formally "reinvented" the game in 1971, distinct from the Waterman tradition. Hasegawa was reportedly unaware of the Victorian Reversi when he developed his version shortly after World War II, initially playing with milk bottle caps. He licensed the game to the Japanese toy manufacturer Tsukada Original, which launched it commercially in 1973.

Hasegawa's genius lay in his thematic branding. He chose the name Othello as a direct reference to William Shakespeare's tragedy. The game's mechanics—black and white pieces constantly flipping allegiances—mirrored the play's central conflict between Othello (the Moor, represented by Black) and Desdemona (represented by White). Furthermore, the green board was chosen to represent the "green-eyed monster" of jealousy, and the erratic, flipping nature of the discs symbolized the duplicitous nature of Iago, who is "two-faced".

While "Reversi" and "Othello" are often used interchangeably in casual conversation, in the realm of competitive strategy and game theory, they refer to distinct rule sets. The modern competitive standard is exclusively Othello.

Reversi (Traditional): The board begins empty. Players alternate placing the first four pieces in the center four squares. This freedom allows for two distinct patterns: the "Cross" (diagonal) and the "Parallel" (vertical/horizontal adjacent).

Othello (Modern): The board begins with the four center pieces pre-placed in a Cross formation (White at D4/E5, Black at E4/D5).

Modern computer analysis has revealed that the "Parallel" opening permitted in traditional Reversi is fundamentally flawed. If players choose the Parallel setup, the first player can force a significant advantage with perfect play. Hasegawa's Othello rules rigidly enforce the Cross opening, which engines like Zebra and Saio have confirmed is a theoretical draw (or extremely close to zero advantage) with perfect play.

Reversi: Originally, the game ended immediately if a player could not make a legal move.

Othello: If a player has no legal moves, they must pass. The opponent continues to play consecutively until the first player can move again.

This "Pass" rule is the cornerstone of modern Othello strategy. It allows for the possibility of a "wipeout" (capturing all opponent discs) and creates the strategic imperative of "mobility." In Othello, one can force an opponent to pass, thereby taking multiple free moves to capture corners and edges unopposed.