the opening phase of a game (e.g., go, chess, shogi); the early moves/strategy
序盤で定跡を外すと苦しい展開になることが多い。
If you deviate from the standard opening in the early phase, the game often becomes difficult.
彼は序盤に堅く守って相手のミスを待った。
He defended solidly in the opening and waited for the opponent's mistake.
序盤の攻め方を研究する。
I study opening strategies.
the early stages; the initial phase or outset of an event, project, or match
プロジェクトの序盤で予算が不足していることが分かった。
We found out in the early stages of the project that the budget was insufficient.
試合の序盤に相手に先制点を奪われた。
We conceded the first goal in the early stages of the match.
新製品の序盤の受注状況は良好だ。
Order intake in the initial phase for the new product is good.