A beginner-friendly Reversi guide to corners, dangerous edge squares, mobility, stable discs and controlled flipping.
By MisterBuddy Editorial · Reviewed for browser play and practical clarity.
Do not judge a move only by how many discs it flips
A move that flips many discs looks powerful, but early in the game that can give the opponent more surfaces to play against. Reversi is often about controlling future options rather than maximising the current count.
Compare moves by asking how many legal replies they give the opponent and whether they improve access to valuable areas of the board.
Corners are permanently stable
A disc placed in a corner cannot be flipped because there is no square beyond it. Corners therefore become some of the most valuable locations on the board.
The challenge is not simply to move toward a corner. You also need to avoid giving the opponent a legal move there. The squares directly adjacent to an empty corner can be dangerous for this reason.
Be careful with corner-adjacent squares
The diagonal square next to a corner and the edge squares beside it can allow the opponent to take the corner when the surrounding line is arranged badly.
These squares are not always forbidden. Later in the game they can be safe when the corner is already yours or the opponent has no route to exploit them. The key is checking the immediate consequence.
Preserve mobility
Mobility is the number of legal moves available. A position with fewer discs can still be strong if it gives you several useful choices while restricting the opponent.
When comparing moves, notice whether one move forces the opponent into a small set of replies. Reducing their mobility can help you control which areas of the board open next.
Edges become stronger after corners are secure
Edge discs can be difficult to flip, but an unsecured edge can also become a route toward a corner. Once you control a corner, building outward from it can create stable discs that remain yours for the rest of the game.
Do not rush to fill every edge. Keep enough flexibility to respond to the opponent and avoid creating an easy corner entry.
Count later, control earlier
The disc count matters at the end of the game, but leading early is not necessarily an advantage. Early and middle-game decisions should focus more on stability, mobility and access to important squares.
As the board fills and legal moves become limited, the count becomes more concrete. Shift your attention toward final conversion only when the position is approaching the closing phase.
Try it on MisterBuddy
The ideas in this guide are easiest to understand through practice. Open the relevant game from the MisterBuddy game library, play a few controlled rounds, and focus on one improvement at a time. Scores and site points are for casual on-site play and are not redeemable for cash.