24. Chasing the same type of pieces

  • Rook chases Rook:
    If both side can capture the other side, this is considered perpetual sacrifice and should be ruled as a draw. If one side cannot capture the other for some reason, the other side cannot perpetually chases it.
  • Cannon chases Cannon:
    If both side can capture the other side, this is considered perpetual sacrifice and should be ruled as a draw. If one side cannot capture the other for some reason, the other side cannot perpetually chases it.
  • Knight chases Knight:
    If both side can capture the other side, this is considered perpetual sacrifice and should be ruled as a draw. If one side is blocked, the other side cannot perpetually chases it. (See examples in Diagram 51 to 55)

Diagram 51: Red (in Capital) moves first

R3=1 r9=8
R1=2 r8=7
R2=3 r7=8
R3=2 r8=9
R2=1 r9=7
R1=3 ...
.

Diagram 52: Red (in Capital) moves first

R8+2 r5+3
R8-3 r5-2
R8+2 r5+2
R8-2 r5-1
R8+1 ....

Explanation:
In Diagrams 51 and 52, the Red Rook perpetually sacrifices and Black can capture it but, due to the circumstance, does not want to. The game should be a draw.

Diagram 53: Red (in Capital) moves first

C3=8 c2=3
C8=7 c3=2
C7=8 c2=3
C8=7 c3=2
C7=8 ...

Explanation:
The Black Cannon cannot capture the Red Cannon. What Red is doing is perpetual chase instead of perpetual threatening to checkmate. Red has to change.

Diagram 54: Red (in Capital) moves first

C7=2 c8=7
C2=3 c7=8
C3=2 c8=7
C2=3 c7=8
C3=2 ...

Explanation:
Although the Black Cannon is confined to the King's row, Red cannon's attack on it is not a perpetual chase because in one of Black Cannon's moves it is protected.

Diagram 55: Red (in Capital) moves first

H2+4 h7+9
H4-2 h9-7
H2+4 h7+9
H4-2 h9-7

Explanation:
The Black knight is blocked, therefore, the Red knight is perpetually chasing the Black knight. Red has to change.

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