Bracket white disks between two teal disks, flip every captured line, and control more squares when neither player can move.
Reversi turns every placement into a directional scan. A legal disk must bracket at least one white disk between the new teal disk and another teal disk, and one move can flip several rows at once. The board starts with four disks in the center, then expands toward edges and corners. The match ends only after neither side has a legal placement, so temporary disk count matters less than stable territory.
Click or tap a legal empty square. Keyboard and mobile-control players cycle through currently legal moves with the arrow buttons, then confirm with Space, Enter, or OK. Illegal empty squares simply do nothing because they bracket no opponent line. The reset control restores the four center disks. During the short AI turn, input is paused so an extra tap cannot spend your next move accidentally.
Each placement earns a base score plus extra points for every disk flipped on that turn. Corners are especially valuable because a corner disk can never be reversed, although the score display still emphasizes actual captures. The final majority supplies the win bonus and rating. Best remains in localStorage on this device, making repeated corner-control practice comparable without an account or network save.
Avoid squares directly beside an empty corner unless the position forces them. Those danger squares often hand the corner to white on the next turn. Build quiet access to the edge, keep several legal choices available, and accept a smaller disk count if it preserves mobility. Near the finish, count parity: when only a few spaces remain, controlling who takes the last move can decide a close board.
On phones, the legal-move cycle is useful when your thumb would cover a corner or narrow edge lane. Pause after each flip animation and rescan all eight directions from the newest disk. Portrait view keeps the entire eight-by-eight board visible, while landscape offers larger cells. Deliberate taps beat fast tapping because a single unsafe edge move can reverse the strategic value of several earlier captures.
Avoid squares directly beside an empty corner unless the position forces them.
On phones, the legal-move cycle is useful when your thumb would cover a corner or narrow edge lane.
Reversi: Each placement earns a base score plus extra points for every disk flipped on that turn
Bracket white disks between two teal disks, flip every captured line, and control more squares when neither player can move.