How to Play Reversi (Othello): Rules and Winning Basics
Reversi is an 8×8 disc game in which every legal placement must sandwich at least one straight line of opposing discs. Those discs flip to your color immediately. The lead can reverse on a single stone, which is why people who only count discs at move 12 get surprised at move 50. GAMEAREA’s live title is Reversi, with the fixed center start popularized under the Othello name. If you care about the trademark history, read Reversi vs Othello after you can make a legal move in your sleep.
On GAMEAREA, legal-move highlights take the rule-checking off your hands so you can look at shape. Turns are enforced: if a placement does not flank, it does not happen. Ranked queues and private rooms use the same engine. Pair this rules article with corner control and parity once the clicks feel obvious.
Setup: four discs, black to play
The board is sixty-four squares. The opening position is always the same in this implementation: two black and two white discs in the four center squares, same colors on a diagonal. Black moves first. There is no dropping extra discs in the corners to “start interesting.” If a friend wants a random start, that is a different house game.
Each player has a supply of discs in their color. You do not run out in a normal game; the limit is empty squares, not inventory. You may only place on an empty square, and only if the placement is legal as defined below.
What makes a placement legal
A move must flank (bracket) at least one continuous line of opponent discs between the new disc and another disc you already own. Lines run horizontally, vertically, or diagonally — eight directions. The sandwiched discs must be adjacent in a straight line with no holes. Your existing disc is the other slice of bread; empty squares do not count as bread.
All flanked lines flip at once. A single placement can flip discs in several directions. Flips are mandatory and immediate; you cannot choose to leave an opponent disc unflipped “for later.” After the flip, those discs are yours for the purpose of future sandwiches, including on the opponent’s next turn if they can recapture them.
If a square does not create at least one sandwich, it is illegal even if it “looks central” or “blocks a corner.” That is the entire placement rule. Everything else — corners, edges, quiet moves — is strategy built on top of this filter.
Passing is not a choice
If you have at least one legal square, you must play. You cannot pass to save a corner. If you have no legal square, your turn is skipped automatically and the opponent plays again. If neither player has a legal move, the game ends even if empty squares remain (this happens when discs lock the remaining pockets).
Worked example: flipping a short row
Picture the opening four: white on d4 and e5, black on e4 and d5 (algebraic labels, files a–h left to right, ranks 1–8 up). Black has exactly four legal first moves: d3, c4, f5, and e6 — mirror images of one another, each sandwiching a single white disc in a straight line (c4 flips d4 against e4; f5 flips e5 against d5). c5, d6, e3, and f4 would be White’s squares in that same position, not Black’s.
Take a slightly later shape. White discs occupy c4, d4, e4. Black has a disc on b4 and wants f4. f4 is empty. Placing black on f4 sandwiches the three whites on c4–e4 between b4 and f4. All three flip black. If black also had a disc on f6, and whites sat on f5, the same placement would flip f5 vertically at the same time. One click, two directions, four discs flipped plus the one you placed. That is legal Reversi. Placing on f4 with no black disc on the other side of those whites would be illegal, highlights or not.
How the game ends and how you win
The game ends when the board is full, or when neither player can move. Count discs. Higher count wins. Ties are possible. There is no kinging, no capturing off the board, no extra points for corners in the official count — corners matter because they never flip, which is a strategic fact, not a scoring bonus.
A player with zero discs left still loses on count if the opponent has more (they will). More commonly, someone dominates the last twenty squares after looking behind for the first thirty. Do not resign on disc count at move 20; the rules allow massive swings because flipped discs can be flipped back until they sit in unflippable locations.
What you can ignore from other games
Reversi is not 9×9 Go. Stones do not stay put; influence is not territory in the Go sense. It is not international checkers; there is no jumping and no flying king. It is not chess tactics with forks. The only tactic is: legal sandwich, then future sandwiches you just created for both players.
People import “always take the most flips” from video-game ports. That is not a rule. It is often a losing heuristic. The rules only require a minimum of one flip. Taking one disc in a corner-adjacent trap can be legal and disastrous; taking twelve discs in the center can be legal and also disastrous. Legality is a gate. Quality is a different article.
Playing it on GAMEAREA
Open Reversi in the browser. Highlights show every square that currently sandwiches something. Use that as training wheels for a few games, then glance at the board first and use the highlight as confirmation. Private rooms exist when you want a known opponent; ranked matchmaking exists when you want a stranger at a similar level; the engine does not change.
A first-session drill: play until you can explain, for every move you make, which disc is the other end of the sandwich. If you cannot point to it, you are clicking lights, not playing. After that, start noticing which flips give the opponent a new legal square next to a corner. That is the doorway into strategy.
Frequently asked questions
Is Reversi the same as Othello?
For this board, yes in the ways that matter: 8×8, fixed four-disc start, flanking flips, most discs wins. Othello is a branded, standardized presentation of that game. GAMEAREA’s catalog name is Reversi. Details live in Reversi vs Othello.
Can I pass if I do not like my squares?
No. If a legal move exists, you must take one. Passing happens only when you have zero legal placements. The opponent then plays again.
Do I have to flip every sandwiched disc?
Yes. All flanked lines flip. You cannot flip only the useful ones. That is why a greedy central dump can hand the opponent a wall of your own discs to recapture.
What if the board is not full but nobody can move?
The game ends immediately. Count discs on the board as they stand. Empty squares simply stay empty.
Where should a beginner play?
Use GAMEAREA Reversi. Legal-move highlights keep the rules honest while you learn. Add a ranked queue once you stop placing next to corners by accident.
