what if the nationalists didn�t lose mainland china?

probably, but it could also have become an Asian tiger earlier with better free market policies, like South Korea or Japan and with Chinas resources and manpower it would easily eclipse those two.

This is an extremely optimistic scenario, which doesn't take into account the actual historical evidence. Taiwan and S. Korea are not comparable to China, by no means.

But still, the nationalists couldn't prevail.

under the KMT's corrupt regime,

• the scourge of opium addiction continues
• uncontrollable populationn growth; China's population would be much higher than the current 1.3 billion
• The Tibet region would almost be de-populated
• continuing the alarming trend over the past centuries---owing to addherence to strict religious practice, under the Dalai Lama, of celibacy
• much lower literacy rate

Thus, on this basis, China would most probably be no more successful than India.

"probably, but it could also have become an Asian tiger earlier with better free market policies, like South Korea or Japan and with Chinas resources and manpower it would easily eclipse those two."

As if,

The growth under nationalist was anything but fast, infact it was stagnating;

The growth under communist was much faster with an average annual growth rate for 1953-1974 as 5.6 percent in GNP, 3.4 percent in GDP per capita; 10.5 percent in industrial production, 2.4 percent in agricultural production, 2.2 percent in population.
By its size, this growth has pushed China to higher level of global power. In 1976 China hand 4.7 percent of the world's share in GNP which is the 6th largest in the world. All this is comparing to a China prior to PRC which had virtually no industry and power. And this is not it. In scientific acheivement, the PRC produced its atomic weapon in 1964, its first space satellite in 1970, ballistic missiles at the same time. It became a major regional power a potential global power and an important actor in international politics, all of which was at its nadir during the nationalists.

The Chinese aren't stupid, they chose the communists over the nationalists for a reason.

The better question is what if there is no great leap forward or dultural revolution, skippking that time frame, China would have already been a economic superpower.

 If the ROC didn't lost her control over the mainland?

Haha,how can that be possible,if they didn't lose,we chinese people will go on fighting until it has been defeated.

Without US,Taiwan and Mainland China would be united long time ago.The KMT army is as weak  as a piece of glass.

Chiang and the Kuomintang were not corrupt.