This is the 627th most frequent Korean word.
대회에서
"At the competition" or "in the tournament."
Here, '대회에서' ('at the competition') refers to the location (or event) where the action of performing took place.
지난 주에 음악 대회에서 연주를 했습니다.
Last week, I performed at the music competition.
'대회에서' in this example signifies the context (the debate competition) within which an action (emphasizing points) occurred.
그는 토론 대회에서 중요한 점을 강조했어요.
He emphasized key points during the debate competition.
In this sentence, '대회에서' ('from the competition') is used to indicate the context or location from which an action occurred, in this case winning a position.