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Trying a bit too hard, or making an odd use of pieces.
To exchange the positions of the king and rook other than by castling. Also known as "Castling by hand".
Placing of pieces and pawns so they both control the centre, and influence other areas of the board. Pieces usually have maximum mobility (and therefore power) when centrally placed.
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To move pieces towards the centre. This can be useful if there is no obvious alternative plan.
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Checkmate in the manner of 1. f3 e3 2. g4 Qh4*
A form of double attack where one piece threatens two enemy pieces at the same time. In a triple fork, three enemy pieces are threatened.
A fork between king and queen.
Voluntarily offering material in exchange for a perceived favourable advantage other than the material.