1.
Go; the board game of Go
A strategic board game played with black and white stones on a 19×19 grid, where players compete to control territory. One of the oldest and most respected board games in East Asia.
囲碁 is the Japanese name for the board game Go, one of the oldest strategy games in the world. Often shortened to just 碁 in casual speech.
Key vocabulary
Usage
The verb for playing Go is 打つ (to play/strike), not する: 碁を打つ. This is shared with 将棋.
Watch out
Not to be confused with 以後 (from now on, hereafter) — same reading, different kanji and meaning.
Cultural note
Go has a long tradition in Japan. The 日本棋院 (Nihon Ki-in) is the main professional organization.