bad aji

Bad aji is a positional weakness containing unfavorable future possibilities for the opponent. These may include a potential cut, invasion, forcing sequence, or ko threat. The weakness need not be immediately exploitable: its adverse possibilities remain available until they are neutralized, become irrelevant, or are converted into a concrete sequence.

Recognizing bad aji helps a player avoid creating latent weaknesses and judge when defensive repair or other preparation is worthwhile. Bad aji is not the same as bad shape. Bad shape primarily describes an inefficient or structurally weak formation, while bad aji describes unfavorable potential left in the position; it can exist even when the stones’ shape is otherwise normal. Whether the aji is truly bad depends on the surrounding position, timing, and the opponent’s ability to exploit it. Not every unresolved possibility requires immediate repair.