I am at library and don't have Chinese input. But as a true fan of both the book and Google, I just used the inter-section time to solve the puzzle:-) (hehe, I have to leave soon because I need to lead another TA section). Today's game, as I predicted yesterday, is not very fair for non-Western people because it's about chess with which we are not familiar.( It will be much better if Google also has a Chinese chess of the puzzle^_^). Anyway, it's not too bad because we have hints from the book. If you could answer the questions successfully, then just forget the chess and you can complete the puzzle.
The First question is asking:What is the spiked belt that silas wears called?" It's obvious. If you really don't know,just google this phrase.
The Second one: "What are the second, third, and fourth leading members of the Priory of Sion called?" As a noble secret society, it must have every title of it sounds noble. Then what is the noble language...?
The Third: "The engraved tablet that is supposed to reveal the hiding place of the Holy Grail is called the..." This one is not very difficult,either. It has a simple name. Very simple.
Hehe, even if you have no idea about the answers to the questions, you can do it brutally. There are three questions, four choice for each. So togather you get 4^3 possibilities which is not a big number. So you could just try and error. I think it would not take too long to crack the puzzle even if you just try the different combinations.