I don't understand why everyone is making such a big deal about this (because it involves the IRS), you sign the paper when you receive your award and unless you are cashing out at the very top with like $10K then you are most likely able to write off all of the winnings and won't have to pay any taxes on it. Everything you do associated with pool can be written off against your winnings(ONLY IF YOU YOU USE A SCHEDULE C for business) Everything including pool time, league fees, travel, food on your trip, entry fees, equipment you bought, even lessons you have paid for, etc. (again, as I stated above, if you are not in the 'business' of making a profit, then you can ONLY deduct these expenses under Schedule A miscelleneous expenses, the total of which much exceed 2% for your adjusted gross income before it can even be deducted. And if you are a poor unfortunate who doesn't own a house and can't itemize, then you can only take the standard deduction and NOT the itemized expenses).
Not true as above in red.