The story of Mòpyon: the notebook game

Ask almost anyone who went to school in Haiti about Mòpyon and you will get a smile. It is the game of the last page of the notebook, of the minutes before the teacher arrives, of a pen passed back and forth across a desk.

An old game with many names

Games where two players try to line up their marks are very old and are found all over the world. The version played with five in a row on a grid is best known internationally by its Japanese name, gomoku, where it is played with black and white stones on the lines of a Go board. In French-speaking countries the pen-and-paper version on squared paper is often called morpion, a name also used for tic-tac-toe. In Haiti it became Mòpyon.

A game that needs nothing

Part of the reason the game spread so widely is that it needs no equipment. Squared school paper already provides the grid; a pen provides the marks. Two classmates can start a game in seconds and stop just as fast when the bell rings. Many Haitians remember games that filled entire pages, the marks crowded so tightly that it took a long look to find who had won.

Simple rules, deep game

The rules take one sentence to explain, but the game is far from simple. Strong players think in threats: open threes that must be blocked, fours that force an answer, and double threats that cannot be stopped. Serious competitions exist around the world, and computer scientists have studied the game for decades. In the 1990s, researchers used computer search to show that the first player can force a win with perfect play on a 15 × 15 board, a result that changed nothing for human players, because no person plays perfectly.

Why we built Mòpyon.net

We wanted a home for the game that feels like it belongs to the people who grew up with it: in Kreyòl first, then in French and English, free to play on any phone, and good enough to compete seriously. Mòpyon.net adds what paper cannot: opponents at any hour, computer players from beginner to expert, puzzles, ratings, tournaments, and department teams so that players can represent where they come from, in Haiti or in the diaspora.

The board on the site still looks like a notebook page on purpose. Whatever new features we add, the game should always feel like the one we played at school.