Korigatachi

Korigatachi describes a position where a group of stones is too dense or compact for the actual value it creates on the board. Although such shapes are often strong or secure, they fail to make efficient use of available space and influence, limiting their strategic potential. Overconcentration is considered a more subtle and damaging inefficiency than thinness because it cannot be easily remedied later in the game.

The term comes from the Japanese verb koru, which can mean to stiffen, congeal, or become overly fixated. This etymology emphasizes the rigidity and lack of flexibility in the shape. Korigatachi is often cited in discussions of shape efficiency and is one of the key concepts introduced through tewari, a method for evaluating positions by hypothetically reordering moves.