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TOT is a Vietnamese chess game, completely offline. No account, no ads, no data collection — just open and play.

PLAY AGAINST THE COMPUTER, EIGHT LEVELS AND FOUR PLAYING STYLES
Lower levels not only think less but also misinterpret the board, so playing against them is like playing against a beginner, not against a strangled machine. Choose additional playing styles: aggressive, cautious, preferring to exchange pieces, or balanced.

Want to practice holding a superior position? Turn on handicap — the computer discards its own Knight, Rook, or Queen and plays to its full potential. Or climb the tower: win this level to unlock the next.

5000 TACTICAL EXERCISES
From Lichess's open library, categorized by skill level and topic. There are daily exercises, a three-minute time trial, and a practice mode that re-practices the exact moves you made that went wrong — something that general exercises can't teach.

GRIPPING AND EXPLAINING WHY YOU MISSED
After each game, the app scores each move using an engine and explains it verbally: forgetting a piece, pushing a piece into a capture position, allowing the opponent to double, missing a checkmate. A correct sacrifice is labeled "excellent". To try a different move, open the analysis table, try it on the table, and the machine scores it on the spot.

PRACTICING THE RIGHT WEAK AREAS
The app reads your game history and error log and directly tells you what kind of mistakes you made, at which stage, which color you're using less effectively, and whether the difficulty level is still manageable. If there isn't enough data, it says there isn't enough, instead of making wild guesses.

LEARN, NOT JUST PLAY
• Learn the rules: thirteen short lessons, from which piece moves to when a draw is achieved
• Openings: 73 named openings, the app corrects mistakes
• Opening traps: eight common traps, and how to punish your opponent
• Strategy lessons: ten concepts such as open columns, knight positions, and passed pawns

• Endgames: seven essential techniques, new positions created each time
• Classic games: five famous games, explanations of each important stopping point
• Reading and recording game logs, and practicing naming squares for those unfamiliar with e4 and Mf3 notation
• Vietnamese-English glossary, 64 entries

ALSO INCLUDES
• A rotatable three-dimensional chessboard, and a two-dimensional board for those who prefer a compact design
• Four chessboard themes and six sets of pieces, changeable at any time
• Two-player gameplay on one machine, or play against another machine on the same Wi-Fi
• Seven clock modes, output Import PGN, back up and restore all data
• Daily problem-solving reminders — off by default
• Vietnamese and English

NO COLLECTION OF ANYTHING
No account, no ads, no tracking. Your games, history and scores

remain on your computer and don't go anywhere.

Exercises are taken from the Lichess open repository, CC0 license.