25. When a Cannon is attacking an unprotected Knight, Guard, Minister, or Pawn that has crossed the river, it will be a perpetual chase even if only the cannon mount moves but neither the attacking Cannon nor the attacked piece moves.
However, perpetually chasing a Pawn that has NOT crossed the river is allowed. (See examples in Diagram 56 to 60)


Diagram 56: Red (in Capital) moves first

P1=2 c5=8
P2=3 c8=7
P3=2 c7=8
P2=3 c8=5
P3=2 ...

Explanation:
The Black Knight is not protected and cannot be perpetually chased. The Red Cannon uses different mounts to attack the Black knight and is perpetually chasing the Black Knight. Red has to change.

Diagram 57: Red (in Capital) moves first

C3=4 c9=6
A4-5 c6=8
A5+4 c9=6
A4-5 c6=8
A5+5 c8=6
A4-5 c6=8
A5+4 ...

Diagram 58: Red (in Capital) moves first

C4=3 c7=6
E1+3 c6=7
E3-1 c7=8
E5+3 c8=7
E3-5 ...

Explanation:
In Diagrams 57 and 58, the Red Cannon keeps chasing the Black Guard or Minister by changing its mounts. Red violates the rule and has to change.

Diagram 59: Red (in Capital) moves first

E3+1 c7=9
E1+3 c9=6
E3-1 c6=9
E1+3 c9=6
E3-1 ...

Explanation:
The Red Cannon perpetually chases the Black Pawn by changing its mounts. Because the Black Pawn has crossed the river, Red violates the rule and has to change.

Diagram 60: Red (in Capital) moves first

E3+1 c7=9
E1+3 c9=6
E3-1 c6=9
E1+3 c9=6
E3-1 ...

Explanation:
Although Red perpetually chases the Black Pawn, which is unprotected, by changing its mounts, because the Black Pawn has not crossed the river this does not violate the rule and the game should be ruled a draw.

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