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A |
B |
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C |
D |
E |
F |
G |
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H |
I |
J |
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K |
L |
M |
N |
O |
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P |
Q |
Put four white chess knights (a,b,c,d) onto squares (A,B,C,D). Put four black chess knights (1,2,3,4) onto squares (N,O,P,Q). Swap the positions of the knights using only knight moves. Moves do not need to alternate in color and you may continue moving a single knight for many moves in succession. At no time may a white and black knight attack one another.
Source: Original.