The cannon may not , by making use of another piece as a gun-mount (WXF is cannon mount) , perpetually chase an unprotected piece be it a horse, advisor, elephant or a pawn that has crossed the river.
This applies even if the cannon remains stationary, only those pieces that function as the gun-mount are moved by either player. Such chase is regarded as perpetual chase and thus a violation of rules. The cannon side must change his moves or he loses.
The EXCEPTION is when such chase is performed on a pawn that has yet to cross the river.
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