The word fast, as applied to moves in go, has several meanings. In general a fast move has more than one purpose or meaning. For example a fast defensive move might strengthen your own group while threatening an invasion of your opponent's territory. A fast running move may advance your group farther into the center or offer more subsequent options. The opposite of a fast move is a slow move. Fast moves may be thin and/or light. Slow moves may be thick and/or heavy.
Certain openings such as nirensei are known for fast developing moves.
Circumstances calling for fast moves