noun
captured stones; captured pieces
In the game of Go, stones that have been removed from the board after being captured.
対局後、上げ石を数えて勝敗を確認した。
After the game, we counted the captured stones to confirm the result.
取り石 also refers to captured stones in Go, but 上げ石 is more common.
Compound of 上げ (age, 'raising' or 'removing') and 石 (ishi, 'stone'), referring to stones lifted from the board.