Topology of Knight Attack

Oak squares materialize the relative position of pieces in order to help visualize in what cases the knight threatens the opponent.

Topology where the knight directly threatens the rook

3 squares

Topologies where the knight may threaten the rook in one move

2 squares

3 squares

4 squares

5 squares

From these topologies can be deduced all the cases where the knight can perform a fork.

2-square fork

3-square fork

4-square fork

5-square fork

Topologies where the knight cannot threaten the rook in one move

2 squares

3 squares

4 squares

5 squares