Here are some additional "Asian Rules" which are often used
in tournaments.
Terminologies:
- Check: A move threatening to take the king in the next move.
- Threat: A move threatening to take a piece in the next move.
- Kill: A move threatening to checkmate by continuous checks in the
next moves.
- Perpetual: Repeated moves under same situation.
Thumb rules
- If only one side is repeating forbidden moves, he should change
them, or he will be ruled a loss.
- If both sides repeat forbidden moves, the game is ruled a draw if
both sides do not change. If only one side keeps checking, he should
change his moves.
- Sometimes a move can be judged in two ways (say, both a threat and a
kill), the one that may be judged as a forbidden move is selected.
- One can ask the arbiter to claim a draw if there are no pieces taken
and no more than 10 checks by him within the latest 60 rounds.
Forbidden Perpetual moves
- Perpetual checks are forbidden.
- Perpetual threats on one unprotected piece (except for a
non-crossed-river pawn) are forbidden.
- Perpetual threats on a chariot with cannons and/or horses are
forbidden.
- Pawns and kings are allowed to do perpetual threats but pawns are
not allowed to do perpetual checks.
Some Other Notes:
- If you touch the chessman, you have to make your move with that chessman.
- Threats alternatively on two or more pieces are allowed.
- Continuous checks or threats under different situations are not
considered as perpetual.
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