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Exchange the black knights with the white knights
as shown in the topmost big illustration in the minimum possible
number of moves. One move is a normal knight's move on any vacant cell
of the board.
The bottom diagram shows some moves of the chess knight which may be
done as follows:
a - one cell in one direction (horizontal or vertical), and then two
cells in other direction (vertical or horizontal);
b - two cells in one direction (horizontal or vertical), and then one
cell in other direction (vertical or horizontal). |
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