Reversi
Play a clean full game against four local AI levels or a friend. Legal moves, unlimited take-backs, exact position sharing, strong endgame search, tactics and Daily all stay in one board-first workspace.
Board options & move list
Coach & local stats
A big flip is not always a good move. Corners cannot be flipped, and restricting the opponent’s legal moves often matters more than winning discs early.
1) Take safe corners. 2) Limit opponent mobility. 3) Avoid gifting corner access through X/C squares. 4) In late endings, count exact parity and final disc margin.
Advanced review, move evidence & local history
Move-quality coach
Local depth-limited search explains mobility, frontier, corner and X/C-square evidence. It is not a perfect-play oracle, world rating, or population percentile.
Three Clean games, same setup
Only completed vs-computer games without Hint/Undo count. This is local stability evidence, not a global ranking.
30-DAY DAILY EVIDENCE
Evidence-based progress
How to play & strategy
A move is legal only when your new disc closes a horizontal, vertical, or diagonal line with one or more opposing discs between your own.
The board shows current legal moves. Good strategy often keeps your own future options open while shrinking the opponent’s reply set.
Each training position has one unique best move verified by exact minimax through the final board, not a hand-written heuristic label.
Use study tools freely. Ordinary wins still count locally, but assisted runs stay separate from clean wins and clean best margins.