When defending yourself or subduing an opponent in a confined space, there are several techniques that can help you deal with it more effectively. Here are some suggestions: 1. **Use the environment**: Observe your surroundings and use walls, furniture, or other obstacles to limit your opponent's space to increase your advantage. 2. **Close-quarters combat**: Confined spaces are not conducive to large-scale movements, so emphasize close-quarters combat techniques such as grappling, punching, elbowing, and kneeing. 3. **Quick decision-making**: In a confined space, time and space are limited, and making decisions quickly is key. Choose efficient attack methods and avoid complex techniques. 4. **Control the opponent**: Control the opponent's position by grabbing or positioning your body as much as possible, and use locks or grappling techniques to limit the opponent's movement. 5. **Stay balanced**: Make sure your body is balanced and has a low center of gravity to increase stability, which makes it easier to maintain control in a confrontation. 6. **Use body parts**: Attack with parts such as the head, elbows, and knees, which are easier to perform in a confined space. 7. **Impact and quick movement**: Use the instantaneous impact to disrupt the opponent's rhythm. You can take a quick forward or sideways move to find a better position. 8. **Sound and psychological warfare**: In a small space, sound travels faster. Try to use sound or quick movements to confuse the opponent and increase psychological pressure. 9. **Reasonable escape route**: Always pay attention to the surrounding environment, look for possible escape routes, and retreat decisively when necessary. 10. **Protect yourself**: Make sure to protect your vulnerable parts, such as the head and abdomen, during the confrontation to avoid injury. Note that any self-defense action should follow the principles of legality and rationality, ensuring safety while respecting the personal rights of others. If possible, take a self-defense course to improve your skills and confidence.