noun
solid connection; firm connection
In go, a connection between stones that is secure and cannot be cut by the opponent. The term is technical and domain-specific.
See also: ツギ
この形はカタツギで、相手に切断される心配がない。
This shape is a solid connection, so there is no worry of being cut by the opponent.
ツギ is the general term for a connection in go; カタツギ specifies a solid, uncuttable connection.
Compound of カタ (kata, 'solid, hard') and ツギ (tsugi, 'connection'), a go term. The exact historical derivation is uncertain, but it follows the pattern of go terminology combining descriptive prefixes with ツギ.