Etymology

joseki

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Today it means: A studied and standardized sequence of moves in game of Go, especially at a corner of the board, in the opening phase of a game. Joseki have a variety of outcomes and can be beneficial or detrimental based on the situation. However, Joseki theoretically include the best moves locally for each player. Full definition →

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The story

From Japanese 定石 (jōseki), literally 定 set + 石 stone.

Etymology from Wiktionary, CC BY-SA 4.0.