Qoutes from Simon Huges at Channel4:
"A chinaman is actually a ball from a normal left-arm spinner that turns the opposite way to his normal delivery"
"Just to complicate things even further, they can bowl the chinaman-googly, out of the back of the hand, which spins the opposite way to the chinaman and the same way as orthodox left-arm spin"
About the first qoute: That's a variation for my take.
About the second quote: Opposite way to chinaman is the normal way of bowling according to his first quote! No need to use the term "chinaman-googly".
Seems like he himself is not that clear on this matter. Any other good and authentic reference to "chinaman-googly"?