Questions??? Regarding taxes of backing???

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I was backed for the Main event and a few small ones and i cashed in 2 of them. I got the W-2G form or whichever form they give you from the Rio. So i take the form to an accountant and he says he has never had anythign like this before and does not know what to do (in regard to the whole backing issue. Is there anyone out there that knows what form i need to file this is or any information/advice on this issue... thanks for any help