noun
promoted piece
Shogi term for a piece that has reached the promotion zone and been flipped to its promoted side, gaining new movement abilities.
See also: 成る
歩が成り駒になると、金と同じ動きができる。
When a pawn becomes a promoted piece, it can move like a gold general.
成り駒は裏返して使う。
Promoted pieces are used flipped over.
成る is the verb 'to be promoted' in shogi; 成り駒 is the resulting promoted piece.
Compound of 成り (continuative form of 成る 'to be promoted') + 駒 'piece'.