Tax Question for Foreign Students in the US

[MexKrax]

I am currently an international student in the US on an F1 visa. Therefore, according to the IRS I am a non-resident alien. As a non-resident alien I only have to pay taxes on US sourced income. From what I've read on the IRS website it seems to me that online poker winnings are not US source income and therefore I do not have to pay taxes to the US goverment on my poker winnings.

Is there anyone out there why knows more about filing non-resident taxes in the US? Am I correct that I don't have to pay taxes to the US government on my poker winnings? If anyone has any information on this either way I'd really appreciate hearing it.