50线为多空分界线，多空线受到50线支撑或压制做多或空；50线上做多，线下不做。
简单实用，无未来。

RSV9:=(CLOSE-LLV(LOW,9))/(HHV(HIGH,9)-LLV(LOW,9))*100;
多空:50+ (CLOSE-MA(CLOSE,40))/MA(CLOSE,40)*100 , COLOR00FF00;
BD:SMA(RSV9,3,1),COLORFFFFFF;
低位:20,POINTDOT,COLORYELLOW;
中位:50,LINETHICK1,COLORRED;
高位:80,POINTDOT;