For 10 points, name this lowest chess piece that represents a pikeman, who attacks one space diagonally but otherwise moves one space forward.
Richard Réti studied an endgame in which White must protect this piece while preventing Black's piece of this type from advancing. In an endgame, one of these pieces is called a "wrong rook" one when a bishop cannot attack a piece blocking this piece's advance. This piece delivers a checkmate in David and Goliath's mate. One of these pieces may capture another en passant when its advance doubles on the first move. A piece of this type may be promoted to another piece of the player's choice when it reaches the opposite side of the board. For 10 points, name this lowest chess piece that represents a pikeman, who attacks one space diagonally but otherwise moves one space forward.
Richard Réti studied an endgame in which White must protect this piece while preventing Black's piece of this type from advancing.
pawn