20. A Cannon and a Knight cannot take turns to perpetually chase a Rook, regardless of whether the Rook is protected or whether the Rook in one or two of its moves has a counter attack. (See examples in Diagram 42, 43, and 44)
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Diagram 42: Red (in Capital) moves first
R3=4 h7+8
R4=3 h8-7 R3=4 h7+8 R4=3 h8-7 R3=4 h7+8 |
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Diagram 43: Red (in Capital) moves first
R4=3 h8-7
R3=4 h7+8 R4=3 h8-7 R3=4 h7+8 |
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Diagram 43: Red (in Capital) moves first
R4=3 h8-7
R3=4 h7+8 R4=3 h8-7 R3=4 h7+8 |