Goldman Sachs upgraded the index last night fyi - think that was what caused the move. "In China, shares were off slightly for the second day in a row on a weak non-manf PMI and reports that govât officials will take further measures to curb inflation. The Hang Seng was an exception, taking a leg up after Goldman Sachs upgraded the index overnight."
Maybe you can ask GS to tell you of their next index upgrade before they announce? If that is really what moves the market, you don't have an edge unless the big boys tell you their plans.