Solve the Following Puzzle!

Consider the 3-by-3 board below. Blue disks move like knights, two squares in one direction and one square in another direction 90 degrees to the right or left; red disks move like rooks, any number of squares up, down, right, or left. The goal is to get the disks marked with A, B, C, or D to the corner with the matching letter.

Solution

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

16.

17.