Wait for Sleep:
I think you have already forgotten it... I find the rule!
rule: Both sides keep checking the other is a draw. ("Resolve check and check back" is a draw.)
http://www.clubxiangqi.com/rules/d4.htm

Wait for Sleep: Oh yes... I understood what you had wanted to say.
My rule book is "Chinese Chess for Beginners by Sam Sloan, fourth printing Nov. 2008".

Wait for Sleep: I think you are *obviously* stronger Chinese chess player than me. So I would like you to understand the meaning of "almost" from the following:

An even more difficult case arises when the position is being repeated because one of the players keeps attacking an enemy piece or else keeps threatening checkmate, without actually giving check. In such cases, the player who is forcing the other to move will be required to make a different move and the game will continue.
In official tournaments there are sometimes disputes about this and an arbiter has to be called. What the arbiter tries to do is to determine the guilt. In other words, there is usually one player, usually the player with the weaker position on the board, who keeps attacking his opponent and forcing the opponent to move back and forth.
In that case, the guilty player will be ordered by the arbiter to change his sequence of moves. However, sometimes it happens that both players are attacking each other. In that case, the game is a draw.

okjb: My rule book : The draw rule is the most complicated in Chinese chess and in fact has not yet been formalized. The reason for this is that perpetual check and perpetual repetition of moves are quite common possibilities in Chinese chess.
In fact, if players were allowed to force a draw by perpetual repetition of position, as they are in international chess, then almost every fairly evenly contested game of Chinese chess would end in a draw.
As a result, perpetual check is almost absolutely prohibited. Generally, the player giving perpetual check is required to make some other move instead. The catch is about this word 'generally' . If the player can prove that he is being forced by his opponent to give perpetual check, then the game might be ruled a draw.

Though I have no eligibility for answering to the survey since I can understand Chinese characters, in arguments in Japan which consider internationalization of shogi, it is certainly come out an opinion that Chinese characters are an obstacle for extension.