reversi.plyyard.com is an 8×8 Reversi site maintained by Ply Yard. Reversi has a useful habit of overturning first impressions: more discs in the middle game may mean less control, one corner can matter more than a crowded edge, and a forced pass can reveal trouble before the score does. The board, rules, and practice notes here are built around those real positions.
Three ways to play, for three different needs
Use the computer game as a workbench. Choose a move before asking for a hint; if it gives away a corner, undo it, try a quieter square, and compare the AI’s reply. All four strength levels run in your browser.
Use two-player mode when the explanation belongs in the room. Two people share one device and take turns pointing out lines and legal moves. A teaching game can be rewound; in a serious game, save the questions until the final count.
Use an online room when you want a proper game with someone you know. Create a room, choose a color, and share the link, or join a public room. Moves are synchronized, there is no one-sided undo, and games already in progress can be watched.
- The Rules page explains legal moves, flips, passes, and the final count.
- The Tips page offers a practical routine for studying your next game.
Where your game is stored
Computer and shared-device games keep their current progress in the browser on this device. Refreshing the page or briefly losing your connection will usually return you to the same position. Starting a new game clears the current local game.
An online room sends moves to the other player and keeps the information needed to reconnect on your device. We do not create a username-and-password account for play.
A board without borrowed status
There are no ranks, rating tables, or automatic matches with strangers. AI strength describes search depth and playing pressure; it is not a judgment of your ability. A hint supplies one candidate move, not an explanation of the whole game. You learn more by testing, comparing, and replaying positions.
You do not need to provide an email address, phone number, or legal name to play. What matters here is whether you can identify one concrete gain or mistake afterward. Remembering “b2 gave away a1” is more useful than receiving an unexplained rating number.
Why we write about corners, mobility, and frontier discs
Rules tell you whether a move is legal. They do not answer the beginner’s harder question: “I flipped so many discs, so why did I lose?” Our notes focus on decisions that repeatedly show up over the board: the danger of X-squares and C-squares beside an empty corner, why mobility matters more than the middle-game disc count, how frontier discs open lines for the opponent, and how to plan the final moves around empty regions.
None of these ideas is a winning formula. Corners still require calculation, extra legal moves can all be bad, and a pass can change parity. We include those limits so every piece of advice can be tested on the board instead of taken on faith.
Our test for useful instruction
Terminology is not the test. A useful paragraph should prompt an observable action in your next game: check all four corners before moving, count each side’s legal moves, spot the X-squares beside empty corners, or pause to count empty squares before the endgame. If a sentence cannot be checked against a position, we add an example, change the order, or cut the empty conclusion.
The Rules page should let a complete beginner finish a first game without help. The Tips page does not promise fast mastery; it replaces vague instinct with judgments you can inspect. If an example position disagrees with the playable board, that is our bug to fix, not an exception the reader is expected to decipher.
How we read feedback
“I don’t understand this” is useful feedback. It becomes even more useful when you name the sticking point: Black’s first move, why a pass occurs, or why games keep going wrong near a corner. For a software problem, a board screenshot, move coordinates, and browser name usually beat a long general description.
We correct reproducible rule errors, connection failures, and misleading explanations. We will not dress AI levels up as fictional ranks to make them sound smarter, or turn a conditional idea into a promise that it always wins.
About Ply Yard
This site is maintained by Ply Yard. The studio also makes other browser board-game tools, but each site operates separately. If the page behaves unexpectedly, the written rules disagree with the board, or an online room will not connect, send the details through Contact.
