Reversi is played with the same rules as Othello. In Itte Dojo you play the AI and get a grade and an explanation for every move, so you can see exactly where your Othello games slip.
How to use
Tap a square with a dot to play. After each move, the dojo computes your loss — how many discs the move gave up compared with the best move — and grades it on a five-step scale. For weaker moves it shows a short reason.
- Hint shows the best move in the current position.
- Take back undoes your last move.
- Compare on the previous position shows the best move (yellow ring), your move (red dashes) and the best line (numbers) on the board.
How grading works
- Bestloss up to 0.5 discs
- Goodup to 2 discs
- Inaccuracyup to 5 discs
- Mistakeup to 10 discs
- Blundermore than 10 discs
Midgame values are estimates from an evaluation function. With 16 or fewer empty squares (18 in deep analysis) the engine tries to solve the position to the end; when it finishes in time, the value is the exact final disc margin (otherwise it is shown as an estimate). Grading and hints always search at least as deep as the AI you play.
Basics that pay off
- Corners can never be flipped. Avoid the squares diagonal to an empty corner (X-squares: b2, g2, b7, g7).
- In the opening and midgame, limiting your opponent's moves matters more than grabbing discs.
- Prefer quiet moves that flip few, inner discs (openness = empty squares touching the flipped discs; lower is better).
- Practice endgame reading with the endgame puzzles.
- Set up any position you wonder about in the position analyzer and see the disc margin of every move.
Notation
Files are a–h from left to right and ranks 1–8 from top to bottom. Black moves first. Games and settings are stored only in this browser and are never sent anywhere.