A dojo for thinking games

The more you think,
the stronger you get.

Chess or Othello — every move is analyzed by the AI, so playing itself becomes practice. Choose your dojo.

The game itself becomes practice

A strong AI analyzes every move, so you build your thinking just by playing. Chess or Othello — the dojo works the same way.

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Move Quality Scores

Every move is rated — Best, Good, Mistake, Blunder. See at a glance where the game turned.

Instant Play

Open it and start in seconds. No account, no install.

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Learn by Undo

Played a weak move? Take it back. Compare it with another and see for yourself why one is better.

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Play Anywhere

Works on phone, tablet, and desktop. Add it to your home screen and launch it like an app, one tap.

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Build Intuition

The more feedback you get, the better you read a position. Good moves start to look obvious.

Choose your dojo

Both free, no signup. Every move gets evaluated, so you improve just by playing.

Chess

The classic game of deep thinking. Every move rated — Best, Good, Mistake, Blunder — with guides from the opening to the endgame.

Enter the Chess Dojo →

Othello

Simple rules, deep reading. A strong engine evaluates every position, with hints and move scoring to sharpen your play.

Enter the Othello Dojo →

Daily Tactics Quiz

Pick the best move on the board. Train your eye for forks, pins, skewers, and mates — a fresh puzzle every day.

Today's puzzle

Pick one of the three candidate moves and press Confirm to see the answer, explained with an arrow on the board. Want to learn more? Read Essential Chess Tactics.

Daily Othello Puzzle

From an endgame position, pick the move that wins by the most discs. Every answer is verified by exhaustive engine search. A fresh puzzle every day.

Today's puzzle

Pick a square and press Confirm to see the answer and the discs it flips. New to Othello? Read the Othello guides.