Jieqi rules

Jieqi is played on the familiar xiangqi board, but every piece except the General starts face down on its usual square. Nobody knows what a hidden piece is — not even its owner — until it moves.

Moving a hidden piece

• A hidden piece moves like the piece that normally stands on its square in xiangqi: a hidden piece in the corner moves like a Chariot, one on the soldiers' row like a Soldier…
• After it moves it turns over to its real piece (random among that side's 15) and moves as that piece from then on.
• Revealed Advisors and Elephants can go anywhere on the board: Advisors leave the palace, Elephants cross the river.
• A captured hidden piece is turned over too, for both players to see.

Everything else as in xiangqi

• Check, checkmate, facing generals and having no legal move all lose.
• Threefold repetition or 60 moves without a capture is a draw; perpetual check or perpetual chase loses for the side doing it.
• Jieqi has its own Elo; jieqi games aren't reviewed by the engine because luck plays a part.