Cờ Tướng Xưa Online is the official mobile game of the Cờ Tướng Xưa project. It is a strategic board game with multiple variants. You can play against other players online and also practice against the computer. There are different variants of the game that you can play such as the classical chess, face-down chess, and puzzle chess.

The game is played on a 7×7 board and you can move your pieces from one corner of the board to the other.

The pieces move according to the following rules:

Face-down chess: Move your king to any position of the 7×7 board and then move your pieces in any direction.