Reversi
Mouse and keyboard
- Click any square marked with a dot to place a disc there.
- Undo takes back your move and the computer's reply together.
Touch
- Tap a dot to place a disc. Tapping anywhere else shakes rather than doing nothing.
- The disc count for both colours is above the board, and the status line says whose turn it is.
This panel
- F full screen
- M sound on or off
- ? this list
- Esc close, or leave full screen
- The clock stops while the board is off screen
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About Reversi
Flank a line, turn it over, and count only at the end.
Reversi is the rare game where being ahead in the middle is usually bad. Every disc you flip is a disc your opponent can flip back, and the only squares that are permanently yours are the corners.
So the game is really about mobility: keeping moves available to yourself while your opponent runs out of them, and taking the count only at the very end.
Also searched for as
- reversi online
- disc flipping game
- play reversi
- reversi vs computer
Whichever name you know it by, it is the same game: it runs in this browser, with no download and no sign-up.
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How to play Reversi
- The board starts with four discs in the middle, two of each colour, placed diagonally. Black moves first.
- A move must flank: place a disc so that one or more unbroken lines of your opponent's discs sit between the disc you just played and another of your own.
- Every disc in every line you flanked turns over. A line can run in any of the eight directions, and one move can flip several at once.
- If you have no legal move, your turn passes and the board says so. If neither player can move, or the board is full, the game ends.
- Whoever has more discs at the end wins. The count while you play is a running total, not a score.
Strategy that actually helps
- Corners never flip. A disc in a corner cannot be flanked, which makes corners worth far more than the discs you take on the way to one.
- Do not take the squares beside a corner early. Playing the diagonal neighbour of an empty corner usually hands the corner to your opponent, and with it the whole edge.
- Fewer discs is often better in the middle game. If you have few discs, your opponent has fewer places to legally play, and running them out of moves is how good players win.
- Count moves, not discs. The player who still has safe moves at the end takes the last squares, and the last squares flip the most.
- Edges are safe only when complete. A lone disc on an edge with gaps beside it is a target; a full edge anchored to a corner is permanent.
Controls
Mouse and keyboard
- Click any square marked with a dot to place a disc there.
- Undo takes back your move and the computer's reply together.
Touch
- Tap a dot to place a disc. Tapping anywhere else shakes rather than doing nothing.
- The disc count for both colours is above the board, and the status line says whose turn it is.