Sitemap
Every page on this site
All 50 pages, grouped by what they are for. If you are after a machine-readable version, there is an XML sitemap as well.
Play
The boards. Everything runs in your browser, free, with no account.
- Play Reversi The main board, set up and ready.
- Play the computer Four strengths, from beginner to a perfect endgame.
- Two player Pass one device back and forth.
Rules
How the game works, with every position generated by the rules engine.
- Reversi rules The complete ruleset in one page.
- How to play Reversi A first game, step by step.
- Board setup Where the first four discs go.
- Scoring Counting up, draws and the tournament rule.
- Legal moves What makes a square playable.
- The passing rule When you must skip a turn.
- When a game ends The three ways a game finishes.
- Who goes first Black opens, and what that is worth.
- How many pieces 64 discs, and why the split is a convention.
- Official Othello rules What the World Othello Federation publishes.
Strategy
Why the player with fewer discs is usually winning.
- Reversi strategy The main guide.
- How to win at Reversi A plan you can follow from move one.
- Corner strategy Why corners decide games.
- X-squares and C-squares The squares beside a corner.
- Edge strategy Playing the four edges.
- Stable discs Discs that can never be flipped again.
- Mobility Keeping your options and taking theirs.
- Parity Who is forced to move last.
- Endgame strategy Playing the last dozen moves.
- Tips for beginners What to do in your first ten games.
- Common mistakes The habits that cost most games.
- Best first move Why all four opening moves are the same.
Openings
The named sequences, and what each one is trying to do.
- Openings index Every named opening on the site.
- Opening strategy How to think about the first ten moves.
- Diagonal openings The diagonal family.
- Perpendicular openings The perpendicular family.
- Parallel openings The parallel family.
Comparisons
One game, two names, and how it sits beside other board games.
- Reversi vs Othello The naming question, answered properly.
- Reversi vs Go Two very different games on a grid.
- Reversi vs chess Depth, complexity and learning curve.
- Games like Reversi What to play next.
History
Where the game came from, and who made it.
- History of Reversi From 1880s England to today.
- Who invented Othello The disputed origin story.
- Goro Hasegawa The man who made Othello.
Computers and the game
What machines have done to Reversi, and how they play it.
- Is Othello solved? The 2023 result, and what it means.
- How Reversi AI works Search, evaluation and endgame solving.
Variants
The same board, different rules.
- Reversi variants Board sizes, free openings and more.
- Anti-Othello The version where fewest discs wins.
Reference
The vocabulary and the shorthand.
Print and buy
For playing away from a screen.
- Printable board A board to print, with coordinates.
- Rules PDF The rules on one printable sheet.
- Best Othello sets What to look for in a physical set.
This site
Who runs it and what it collects.
Not finding it?
Start from the rules if you want to know how the game works, strategy if you keep losing, or the glossary if you have run into a word you do not know. If a page is missing or a link here is broken, please say so.
Otherwise, the board is on the home page and the computer is ready for a game.