At around purple belt level karateka learn one-step sparring (ippon kumite). Though there is only one step involved, rather than three or five, this exercise is more advanced because it involves a greater variety of attacks and blocks usually the defenders own choice. It also requires the defender to execute a counter-attack faster than in the earlier types of sparring. Counter-attacks may be almost anything, including strikes, grapples, and take-down manoeuvres.
Some schools prescribe the defences, most notably the Kase-ha Shotokan-ryū, which uses an eight step, three directional blocking and attacking pattern, which develops from yellow belt level through to advanced level.