fast go; speed go
A variant of the board game Go played with very short time limits, emphasizing quick thinking.
In a fast go tournament, you must play each move within 10 seconds.
彼は早碁が得意で、短時間で的確な手を打つ。
He is good at fast go, making accurate moves in a short time.
Compound of 早 (はや, 'fast') and 碁 (ご, 'Go'). The exact historical origin of the term is uncertain, but it naturally describes a speed-focused version of the game.