time and both persist in not making an alternate move, the game can be ruled as a draw. Different sets of rules set different limits on what is considered perpetual. For example, club xiangqi rules allow a player to check or chase six consecutive times using one piece, twelve times using two pieces, and eighteen times using three pieces before considering the action perpetual. The above rules to prevent perpetual checking and chasing, while popular, are not the only ones; there are numerous end game situations. Pieces Each player controls an army of 16 pieces; the armies are usually coloured red and black. Pieces are flat circular disks labelled or engraved with a Chinese character identifying the piece type, and in a colour indicating which player has ownership. The black pieces are marked with somewhat different characters from the corresponding red pieces. On mainland China, most sets still use traditional Chinese characters (as opposed to simplified Chinese characters). Modern pieces are usually plastic, though some sets are wooden, and more expensive sets may use jade. In more ancient times, many sets were simple unpainted woodcarvings; thus, to distinguish between pieces of the two sides, most corresponding pieces used characters that were similar but varied slightly. This practice may have originated in situations where there was only one material available to make the pieces from and no colouring material available to distinguish the opposing armies. The oldest xiangqi piece found to date is a (chariot) piece. It is kept in the Henan Museum. General Generals (or kings) are labelled 將 (trad.) / 将 (simp.) ("general") on the black side and 帥 (trad.) / 帅 (simp.) ("marshal") on the red side. The general starts the game at the midpoint of the back edge, within the palace. The general may move and capture one point orthogonally and may not leave the palace, with the following exception. If the two generals face each other along the same file with no intervening pieces, the 飛將 ("flying general") move may be executed, in which the general to move crosses the board to capture the enemy general. In practice, this rule means that creating this situation in the first place means moving into check, and is therefore not allowed. The Indian name king for this piece was changed to general because of Chinese naming taboos; China's rulers objected to their royal titles being given to game pieces.