It is an afterthought to judge whether it is effective or not. The pressure level drops, indicating that the pressure is effective and the support level rises, indicating that the support is effective. However, if it works today, it does not mean that it will not fail tomorrow. So pressure support is not used for prediction, but for operation.

Whether it is effective or not, the right trader breaks through the pressure to buy and falls below the support to sell; Left-handed traders buy when they fall to support and lighten up when they are under pressure. Effective and invalid positions are determined by position management and stop loss. If their breakthrough is ineffective, they will make money, but they will not break through effectively and will be cheated.