We have already learned that each piece has its own special type of move.
These different types of move mean that the pieces are not all the same in
the amount of work they can do.
We can find out the amount of work a piece can do by counting the squares
it can control. Look at this example:-
In this diagram, the white rook on a8 controls 14 squares, along the 8th rank
and the a-file. The Knight, however, controls only 8 squares and no matter where
on the board you put a knight, it never controls more than 8 squares, and if
you put it near the edge, it controls fewer.
It is fairly obvious from this diagram that a Rook is more powerful than a
Knight and it has a greater Value.
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