Assertion: chess set's piece | /r/HasProperty | developed
Facets:
Source sentences:
text: There is no clear line between the opening and the middlegame, but typically the middlegame will start when most pieces have been developed.
text: The middlegame is the part of the game after most pieces have been developed.
text: Bilingual pieces with both Japanese characters and English captions have been developed as have pieces with animal cartoons.