Piece (chess)

Definition and stakes

Franklin K.‏ Young,  Chess Generalship, Vol. I. Grand Reconnaissance

“ All the Chess-pieces are equal in strength, one to the other. The Pawn can overthrow and capture any piece—the Queen can do no more.
That is to say, at its turn to move, any piece can capture any adverse piece; and this is all that any piece can do.
It is true that the Queen, on its turn to move, has a maximum option of twenty-seven squares, while the Pawn’s maximum never is more than three.
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Source: Gutenberg

Charlotte Boardman Rogers,  How to Play Chess (1907)

“ To guard or support a Piece by the interposition of another force between the Piece attacked and the attacking Piece. A superior force is protected or covered from attack by an inferior one.
Queening a Pawn or Advancing a Pawn to Queen. When a player has advanced a Pawn to the eighth, or last, square of a file, it assumes the rank and power of a Queen or any other Piece, excepting a King, that the player chooses, in which case he is said to have Queened a Pawn.
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Source: Wikisource

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