You are either fighting with rules(sport) or no rules(sport or real fight..you could conceivably do no rules sport fighting)
Asymmetrical sparring. There are rules to govern the training, but there is no winner or loser. There is only success or failure of the defender. The attacker's job is to make sure the defender executes the technique.
Let me give an example. I am the defender. My partner is the attacker.
- He throws a punch combination. I get punched. I failed.
- He throws a punch combination. I manage to grab his arm, but he punches me with his other hand. I failed.
- He throws a punch combination. I manage to grab his arm, and keep him from punching me with his free hand. He escapes. I failed.
- He throws a punch combination. I manage to grab his arm, and secure my grip, but I can't execute a take-down in a reasonable amount of time. I failed.
- He throws a punch combination. I manage to grab his arm, and secure my grip, and execute the take-down, but he is able to bring me down with him. I failed.
- He throws a punch combination. I manage to grab his arm, and secure my grip, and execute the take-down, but I lose my grip in the level change. I failed.
- He throws a punch combination. I manage to get him down into a controlled position, but I don't have the right leverage for the submission. I don't get a chance to correct this. I failed.
- He throws a punch combination. I manage to get him down into a controlled position, and I take too long to decide the right submission to take. I failed.
- He throws a punch combination. I block until I am able to grab hold, and control the situation until his only option is to tap. I succeeded.
For him, there is no "success" and "failure". There is no winning or losing. His only goal is to give me a good test of my abilities. There are rules, and to some degree it is a game. If at any point I hesitate, fail to execute, or leave an opening, then I fail.
Half of the time, even if I succeed, my Master tells me why I failed, something I left open that my opponent didn't see. There are also rules relating to how much force we can use, because we're not about broken bones and concussions.
This is not a real fight. It is not sport-based. It is asymmetrical. But there is definitely resistance. These sparring matches are not scripted, and we take turns who is the attacker and defender.
It's similar (but opposite) to puppies or kittens playing chase, in which one plays the role of the predator, and the other the prey. In Chase, the predator is the one who is the focus, since good chasing skills are necessary for the hunt. In the case of us, it is the prey - the defender - who is the focus, so we can train to defend ourselves from predators.