Following consultation with experienced Xiangqi players we have a couple of minor updates for the game.

We now display a warning to a player who has a possible move that loses them the game by perpetual check, reflecting OTB play with an arbiter. Perpetual Check is seen in Shogi and Xiangqi (including both mini variants), and is when a player chases the opponent's King by checking.

The second change disables the option to claim a draw through threefold repetition in Xiangqi games.

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