professional shogi player; professional go player
Refers to a person who makes a living playing shogi or go at a professional level. The context usually makes it clear which game is meant.
彼は若くして棋士になった。
He became a professional shogi/go player at a young age.
棋
After years of hard work, he became a professional shogi player.
Matches between professional shogi/go players often last for many hours.
She competes in tournaments at home and abroad as a professional player.
将棋 is the game of shogi itself, while 棋士 refers to the professional person who plays it.
囲碁 is the game of go itself, while 棋士 refers to the professional person who plays it.
棋士 means any professional go or shogi player, whereas 棋聖 is a specific prestigious title only the tournament winner holds.
More formal than 人 — used for headcounts in reservations, staff lists, and announcements (5名様).
The everyday counter for people: 一人 (ひとり), 二人 (ふたり), 三人 (さんにん).
female professional shogi player; female professional go player
棋 (go/shogi) + 士 (person of a certain profession). The term originally referred to professional players of board games like go and shogi.