Since last year BULA has been using the WFDF rules with a BULA appendix. This allows all players worldwide to have the same basis to play with (with the exception of the US that uses the UPA rules)
If you want to know how good your rules knowledge is, check out the Rules Quiz at: http://rjhberg.googlepages.com/WFDFQuiz2009.xls
This quiz is in Excel. I recommend you “Enable Macros” when opening. That way the answers can be revealed by clicking on the “Answers” button. If not, you can use the “unhide” function to reveal the answers.
Happy quizzing!