A knight should always be close to where the action is, meaning it is best used on areas where the opponent(s) are clustered or close together. The knight moves alternately to light and dark.
It is sometimes referred to as a "horse", which is also the translation of the piece's name in several languages. Some languages refer to it as the "jumper", reflecting the knight's ability to move over pieces in its way
The knight's ability to "jump over" other pieces means it tends to be at its most powerful in closed positions. It is more powerful if placed near the center, but this is particularly true for a knight. A knight on the edge attacks only three or four squares and a knight in the corner only two.
Moreover, it takes more moves for an uncentralized knight to switch operation to the opposite side than an uncentralized bishop, rook, or queen. The mnemonic phrases "A knight on the rim is grim" or "A knight on the rim is dim" are often used in chess to reflect this principle.
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summary: every david tennant character is the horse chess pieces