Glossary of Judo terminology
Go no sen (Counterattack style judo)
"Go no sen" (Counterattack style Judo) is a Kaeshi-waza (Counter techniques) which is used against a Waza that the opponent has initiated.
In Judo, the term "Go no sen" (Counterattack style Judo) refers to an immediate counterattack in response to the opponent's attack, thereby taking the opponent by surprise and turning the tables on him / her. Following the opponent's initial attack, one uses Tai-sabaki (Body shifting / Body control) to change the conditions and expose the opponent's weak point, thereby reversing the flow and putting oneself in the advantageous position.
Similar maneuvers include the Go sen no sen (Counterattack technique), and the Sen sen no sen (Preemptive technique).