Reversi

What is Reversi?

Reversi is a two-player strategy board game played with double-sided discs — dark on one face, light on the other — on a plain 8×8 grid. It is the classic disc-flipping game that many people also know under the trademarked name Othello, and the rules are wonderfully simple to pick up. Each turn a player drops a single disc of their colour onto an empty square, and any straight line of the opponent's discs that gets trapped between the newly placed disc and another disc of the mover's colour is captured — every trapped disc is flipped over to show the mover's colour instead. Because a single well-placed disc can flip a whole row, a column or a diagonal at once, the balance of the board can swing dramatically from one move to the next. On vygam you command the dark discs and always move first, while a computer opponent answers with light.

The game begins with just four discs in the centre of the board — two dark and two light set in a criss-cross pattern — and grows from there until the squares run out or neither side can move. When play ends, you simply count discs: whoever shows more of their colour on the board is the winner, and an equal split is a tie. That tiny rule set hides enormous depth. A move that flips the most discs early on often turns out to be a mistake, because the board keeps changing hands right up to the final placement, and the only discs that can never be flipped are the four corners. This tension between short-term greed and long-term control is exactly what makes Reversi such a rewarding brain game: a couple of rounds sharpen your planning, your patience and your eye for the quiet move that wins the board twenty turns later.

How to Play

Reversi has only a handful of rules, but some placements are simply not allowed. A move is illegal when:

• it lands on a square that is already occupied — discs may only be played onto empty squares;
• it flanks nothing — a placement that fails to trap at least one opposing disc in some straight line is not a legal move;
• you try to skip a turn while a legal move exists — if you can flank, you must play, and passing is only forced when you have no legal move at all;
• you expect a trapped line to survive — all bracketed discs in every valid direction flip, and you cannot choose to flip only some of them;
• you try to flip a corner disc — corners can never be flanked, so once a corner is taken it belongs to that colour for the rest of the game.

Reversi Tips & Strategy

Reversi looks like a game about flipping as many discs as possible, but that instinct is a trap. The board changes hands until the very last move, so position matters far more than your disc count in the opening and middlegame. Build these four habits and you will start beating the Medium and Hard computer.

1. Take the corners

   A corner disc can never be flanked, because it has no square on its far side for an opponent to close a line into. That makes corners permanent anchors: they hold their colour to the final count and let you build stable edges outward. Whenever a corner becomes available, grabbing it is almost always the strongest move on the board — and denying one to your opponent is just as valuable.

2. Beware the squares next to a corner

   The squares diagonally next to an empty corner — often called X-squares — are the most dangerous on the board. Playing one usually opens a line that lets your opponent drop straight into the corner on their next turn. The two edge squares beside a corner carry a similar risk. Treat the ring around each empty corner as poison until the corner itself is settled.

3. Play for mobility, not disc count

   Mobility means how many legal moves you have. If you keep your options open while squeezing your opponent down to just one or two replies, you can force them onto bad squares — including those corner-adjacent traps. Counter-intuitively, holding fewer discs in the middlegame often gives you more mobility and more control, so resist the urge to flip everything in sight.

4. Think about parity and the last move

   Because discs keep flipping, the player who makes the final move in a region often scoops a large, unanswerable swing. Count the empty squares in each pocket of the board and try to arrange that the last disc in the key areas is yours. Patience wins: a quiet, edge-building move that sets up the endgame usually beats a flashy flip that surrenders a corner.

Reversi Difficulty Levels

vygam offers three levels so the challenge can grow with you. Easy plays a short, greedy game — it tends to grab whatever flips the most discs right now and will happily hand you a corner, which makes it a friendly way to learn the flanking rule and see how flips ripple across the board. Medium looks a few moves ahead with a proper positional evaluation, so it starts protecting corners, punishing loose X-square moves and fighting for the edges.

Hard searches deeper still and switches to counting discs precisely as the board fills up, so it rarely gives a corner away and squeezes hard in the endgame. Your win–loss record against the computer is saved on your device for every visit, so you can track your progress as you climb from Easy to Hard. Turn Show moves off once the flanking rule feels natural and you want to spot your own legal placements — a great way to sharpen the board vision that separates a casual player from a strong one.

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