A mirror image of a right-armer's legbreak, a chinaman is a ball from a left-armer that is bowled over the wrist and turns the opposite way to orthodox left-arm spin. In other words, it spins in to the right-hand batsman and away from the left-hander - from left to right on a TV screen.
Charlie "Buck" Llewellyn, a South African allrounder who played circa the end of the 19th century, laid claim to inventing the delivery. But the term is more traditionally believed to have originated with the former West Indian spinner Ellis "Puss" Achong. In the 1933 Old Trafford Test, Achong, a left-arm orthodox spinner and the first Test cricketer of Chinese ancestry, bowled an unexpected wrist-spin delivery that turned from off to leg, and had the English batsman Walter Robins stumped. Legend has it that Robins, as he walked back to the pavilion, remarked, "Fancy being done by a bloody Chinaman."
Chuck Fleetwood-Smith, Garry Sobers, and more recently, Paul Adams, Michael Bevan, Brad Hogg, and Dave Mohammed are among the better known ones.
A googly, just like a legspinner. Only in this case the googly leaves the right-hander and comes into a left-hander.
It is difficult to control left-arm wrist spin (as also traditional legspin). And by and large the ball coming in to a right-hander is considered less dangerous than the one leaving him.