"The strong showing today is not a big surprise as the Chinese bourses are probably playing catch-up after both the Hang Seng Tech Index in Hong Kong and the Golden Dragon Index in the U.S. surged by over 10% in the first week of October when Chinese markets were closed for the Golden Week holidays.

Goldman Sachs predicts that the blowout surge in China's stock market still has a ways to go, with another 15% to 20% upside ahead. It's a standout call for a market that has already impressed in recent weeks.

Chinese stocks began Tuesday’s session with a bang — an onshore benchmark surged 11% as soon as trading resumed after a weeklong break. But the enthusiasm faded as the day progressed, with the lack of more major stimulus from a key policy meeting disappointing investors.