Topologie Of Knight's Attack

Associated Forks
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Oak squares show relative position of pieces in order to help to visualize when the knight is threatening the enemy.

Topology where the knight threatens the rook directly

3 squares



Topologies where the knight may threaten the rook in one move


2 squares



3 squares




4 squares
 





 5 squares
 



Topologies where the knight cannot threaten the rook in one move 

2 squares


3 squares


4 squares
 

5 squares
 

















Out of these topologies you can deduce all cases when the knight can carry out a fork.


2 square fork


3 square fork



4 square forks
 


5 square forks